Best Grease Interceptor For 3 Compartment Sink
If you run a commercial kitchen with a 3 compartment sink, you already know that managing grease and fats is one of the biggest headaches. Without the right grease interceptor, you’re looking at clogged drains, foul odors, and potential fines from your local health department. Choosing the best grease interceptor for a 3 compartment sink means finding the right balance between flow rate, capacity, durability, and ease of maintenance. We’ve done the heavy lifting for you — here are our top 10 picks after thorough research and testing.
Quick Product Comparison
Our Top 10 Best Grease Interceptor For 3 Compartment Sink Reviews – Expert Tested & Recommended
1. Stainless Steel Grease Trap with 3 Inlets for Under Sink Use in Restaurants and Kitchens, 40x16x14in
If you’re running a busy commercial kitchen with a 3 compartment sink, this stainless steel grease trap is a game-changer. The triple inlet design means you can connect all three compartments directly, which simplifies your plumbing setup significantly. At 40x16x14 inches, it’s spacious enough to handle high-volume wastewater without breaking a sweat.
Key Features That Stand Out
- ✓ Three inlet ports — perfect for connecting all three sink compartments in one unit
- ✓ Thickened stainless steel construction — resists corrosion and lasts for years of daily use
- ✓ Multi-baffle design — maximizes grease separation efficiency through physical flow diversion
- ✓ Available in six specifications — so you can match the exact capacity your kitchen needs
- ✓ Gravitational sedimentation principle — lets grease float to the top while clean water flows out
Why We Recommend It
This is our top pick because it solves the biggest problem with 3 compartment sinks — managing multiple drain lines. Instead of installing three separate grease traps, this unit consolidates everything into one. The stainless steel body means you won’t have to worry about rust or degradation over time, even with heavy daily use.
Best For
Restaurants, cafeterias, and commercial kitchens that need a single, high-capacity grease interceptor to handle all three compartments of their sink setup.
Pros and Cons
Pros:
- Triple inlet design eliminates the need for multiple grease traps
- Stainless steel body is extremely durable and corrosion-resistant
- Multiple size options available to fit different kitchen needs
- Efficient multi-baffle system captures grease effectively
Cons:
- Larger footprint may not fit in tight under-sink spaces
- Higher price point compared to smaller single-inlet models
Customer Reviews
Customer Review: “We installed this in our restaurant kitchen to handle all three compartments of our wash sink. The three inlet design is exactly what we needed — no more juggling multiple traps. Build quality is solid and it’s been running for months without any issues.”
Customer Review: “Great grease interceptor for the price. The stainless steel feels premium and the baffle system works really well. We noticed a huge difference in our drain lines after installing this. Cleaning is straightforward too.”
2. Gerrii 7.6 Gallon Grease Trap with Removable Basket for Commercial Kitchens, 7 GPM
The Gerrii 7.6 Gallon Grease Trap is a smart choice for commercial kitchens that want reliable grease separation without the weight and cost of stainless steel. Its 7-stage filtration system is genuinely impressive — it uses a multi-layer baffle design that catches more grease than most competitors at this price point. The removable basket makes cleanup a breeze.
Key Features That Stand Out
- ✓ 7-stage advanced filtration system — multi-layer baffle design maximizes oil-water separation
- ✓ Thick high-density polyethylene construction — won’t rust, corrode, or degrade over time
- ✓ Removable basket — makes cleaning and maintenance quick and hassle-free
- ✓ Space-saving under sink design — compact footprint fits easily in tight spaces
- ✓ 7 GPM flow rate — handles the output of a 3 compartment sink without backing up
Why We Recommend It
This is our editor’s choice because it hits the sweet spot between performance, price, and ease of use. The 7-stage filtration is a standout feature that you typically only find in more expensive models. Plus, the polyethylene body means zero rust concerns — something metal traps can’t promise.
Best For
Small to medium commercial kitchens, food trucks, and restaurants looking for an affordable yet highly effective grease interceptor with easy maintenance.
Pros and Cons
Pros:
- Advanced 7-stage filtration outperforms many competitors
- Lightweight polyethylene body won’t rust or corrode
- Removable basket simplifies cleaning
- Compact design fits under most standard sinks
Cons:
- Plastic construction may not feel as premium as stainless steel
- 7 GPM may be insufficient for very high-volume kitchens
Customer Reviews
Customer Review: “We’ve been using this in our small restaurant for about six months now. The removable basket is a lifesaver — cleaning takes maybe five minutes. The filtration works great and we haven’t had any drain issues since installation.”
Customer Review: “Honestly didn’t expect much at this price, but this grease trap surprised me. The multi-layer baffle system really does catch a lot of grease. It’s lightweight and easy to install too. Would recommend for any small kitchen.”
3. John Boos GT-8 Carbon Steel Grease Interceptor, 14.2" x 11.2" x 10.5", 8 lbs Capacity
John Boos is a name that carries weight in the commercial kitchen world, and the GT-8 lives up to that reputation. This compact carbon steel grease interceptor is built like a tank with TIG-welded 11 gauge steel and a corrosion-resistant coating. At 8 lbs capacity, it’s perfect for smaller setups or as a supplementary trap for individual compartments.
Key Features That Stand Out
- ✓ TIG welded 11 gauge carbon steel — 1/8 inch thick steel provides exceptional durability
- ✓ Corrosion-resistant coating — extends the life of the steel even in wet environments
- ✓ Non-skid cover with locking device — keeps the lid securely closed during operation
- ✓ Removable baffle — allows for thorough cleaning and maintenance
- ✓ Compact footprint — measures just 14.2" x 11.2" x 10.5" for easy under-sink installation
Why We Recommend It
This is our budget pick because John Boos delivers commercial-grade quality at a price that won’t hurt your wallet. The build quality is genuinely impressive — TIG welding and 11 gauge steel are features you’d expect to see in much more expensive units. If you want something that lasts without spending a fortune, this is it.
Best For
Small restaurants, cafes, and food service operations that need a reliable, no-frills grease interceptor from a trusted brand without overspending.
Pros and Cons
Pros:
- Exceptional build quality with TIG-welded carbon steel
- Trusted John Boos brand with a long reputation in commercial kitchens
- Compact size fits easily under most sinks
- Locking cover prevents accidental opening
Cons:
- 8 lb capacity may require more frequent cleaning in busy kitchens
- Carbon steel, even with coating, is more prone to rust than stainless steel over time
Customer Reviews
Customer Review: “John Boos never disappoints. This grease trap is solid — you can tell it’s well-made the moment you pick it up. We’ve had it in our cafe for over a year and it still works perfectly. Great value for the money.”
Customer Review: “Perfect size for our small kitchen. The locking cover is a nice touch — keeps everything secure. We clean it weekly and it’s holding up well. Would definitely buy again.”
4. BESEDER 10 GPM Grease Trap Interceptor, 20 lb Capacity, ASME Certified Plastic
The BESEDER 10 GPM Grease Trap is a solid mid-range option that brings ASME certification to the table — a big deal if your local health department requires certified equipment. The 20 lb capacity and 10 GPM flow rate make it well-suited for a 3 compartment sink in a moderately busy kitchen. The plastic construction keeps things lightweight and rust-free.
Key Features That Stand Out
- ✓ ASME certified — meets industry standards for grease interceptor performance
- ✓ 20 lb grease capacity — handles the output of a busy 3 compartment sink
- ✓ 10 GPM flow rate — processes wastewater quickly without backups
- ✓ 1/4 inch thick plastic walls — durable, rust-proof, and leak-resistant
- ✓ Multistage cleaning system — effectively treats mineral, animal, vegetable, and mixed oils
Why We Recommend It
ASME certification is the main selling point here. If you’re in a jurisdiction that requires certified equipment, this BESEDER unit checks that box without forcing you into a much higher price range. The 10 GPM flow rate is also a nice match for the combined output of a 3 compartment sink.
Best For
Commercial kitchens that need ASME-certified equipment for health code compliance, especially those with moderate to high wastewater volume from a 3 compartment sink.
Pros and Cons
Pros:
- ASME certification ensures compliance with health regulations
- Good 20 lb capacity for medium-volume kitchens
- Plastic body eliminates rust and corrosion concerns
- Multistage system handles various oil types effectively
Cons:
- Plastic may not be as durable as steel in the long run
- 10 GPM may still be tight for very high-volume operations
Customer Reviews
Customer Review: “Needed an ASME-certified trap for our health inspection and this one did the job. Installed it under our 3 compartment sink and it handles the flow well. The plastic body is surprisingly sturdy.”
Customer Review: “Good grease trap for the price. The multistage system seems to work well — we’ve had fewer drain issues since switching to this. Cleaning is easy enough. Happy with the purchase overall.”
5. 4 GPM Grease Trap Interceptor for Home and Food Truck, 8 lb Capacity, ASME Certified
Don’t let the “home and food truck” label fool you — this 4 GPM grease trap is a capable little unit with ASME certification that can work well for smaller 3 compartment sink setups. The 8 lb capacity and compact dimensions make it a practical choice when space is at a premium. It’s also one of the most affordable certified options out there.
Key Features That Stand Out
- ✓ ASME certified — meets regulatory requirements for grease separation performance
- ✓ 1/4 inch thick plastic walls — durable and completely rust-proof
- ✓ Compact dimensions (15.75" x 13.2" x 10.63") — fits easily under most sinks
- ✓ Multistage cleaning system — handles mineral, animal, vegetable, and mixed oils
- ✓ Lightweight plastic construction — easy to install and move when needed
Why We Recommend It
This is a great entry-level option for anyone who needs ASME certification on a tight budget. It’s also perfect for food trucks or small operations where a full-size commercial trap would be overkill. The compact size is a real advantage when you’re working with limited under-sink space.
Best For
Food trucks, home-based food businesses, and small commercial kitchens with a 3 compartment sink that don’t produce massive amounts of greasy wastewater.
Pros and Cons
Pros:
- ASME certified at a very affordable price point
- Compact and lightweight for easy installation
- Plastic body will never rust or corrode
- Multistage system handles various oil types
Cons:
- 4 GPM flow rate is on the low side for busy commercial kitchens
- 8 lb capacity requires frequent cleaning in high-use environments
Customer Reviews
Customer Review: “Bought this for our food truck and it’s been great. Small enough to fit in our tight plumbing setup but still does a good job catching grease. The ASME certification was required for our permit, so that was a bonus.”
Customer Review: “Good little grease trap for the price. We use it in our small cafe under a 2-compartment sink and it works fine. I wouldn’t recommend it for a high-volume kitchen, but for us it’s perfect.”
6. Wentworth 8 Pound Carbon Steel Grease Trap for Under Sink Kitchen Use, 4 GPM
The Wentworth WP-GT-4 is a no-nonsense, PDI certified grease trap that gets the job done. Made from 3mm heavy-duty carbon steel, it’s built to withstand the rigors of daily commercial kitchen use. The 2-inch threaded inlet and outlet ports make installation straightforward, and the 4 GPM flow rate is adequate for smaller 3 compartment sink setups.
Key Features That Stand Out
- ✓ PDI certified — meets Plumbing Drainage Institute standards for grease interceptor performance
- ✓ 3mm heavy-duty carbon steel — thick, durable construction for long service life
- ✓ 2-inch threaded inlet/outlet ports — easy and secure plumbing connections
- ✓ 4 GPM flow rate — suitable for low to moderate volume kitchens
- ✓ Efficient settling and floating design — separates solids and grease from wastewater effectively
Why We Recommend It
PDI certification is a mark of quality that many local codes require, and the Wentworth delivers that at a reasonable price. The 3mm carbon steel body is noticeably thicker than many competitors, which gives you confidence it’ll last. It’s a reliable workhorse for any small to medium kitchen.
Best For
Small restaurants, cafes, and institutional kitchens that need a PDI-certified grease interceptor for a 3 compartment sink with moderate wastewater output.
Pros and Cons
Pros:
- PDI certification meets many local plumbing code requirements
- Thick 3mm carbon steel construction is very durable
- Threaded connections make installation simple and secure
- Compact and easy to fit under most sinks
Cons:
- 4 GPM flow rate limits use in high-volume kitchens
- Carbon steel requires the coating to remain intact to prevent rust
Customer Reviews
Customer Review: “Solid little grease trap. The PDI certification was important for our local code and this fit the bill. Installation was easy with the threaded ports. Been using it for eight months with no complaints.”
Customer Review: “Good quality for the price. The steel body feels heavy-duty and well-made. We use it under our prep sink and it handles the grease well. Just make sure you clean it regularly.”
7. GarveeTech 25 LB Stainless Steel Grease Trap with Top Inlet for Commercial Kitchens, 13 GPM
The GarveeTech 25 LB Stainless Steel Grease Trap is built for serious commercial use. With a 13 GPM flow rate and 25 lb capacity, it can handle the combined output of a 3 compartment sink in even the busiest kitchen. The top inlet design offers flexible plumbing options, and the stainless steel body ensures years of reliable service.
Key Features That Stand Out
- ✓ 13 GPM flow rate — one of the highest in this roundup, ideal for busy kitchens
- ✓ 25 lb grease capacity — reduces cleaning frequency significantly
- ✓ High-grade stainless steel — rust-proof and built for long-term durability
- ✓ Top inlet design — offers flexible installation options for various plumbing configurations
- ✓ Efficient oil-water separator — keeps your drains clear and operations smooth
Why We Recommend It
If you’re running a high-volume kitchen and need a grease interceptor that can keep up, the GarveeTech is hard to beat. The 13 GPM flow rate means it won’t bottleneck your drainage, and the 25 lb capacity means less frequent cleanouts. The stainless steel construction is the cherry on top for long-term reliability.
Best For
High-volume restaurants, hotel kitchens, and institutional food service operations with a 3 compartment sink that generates large amounts of greasy wastewater.
Pros and Cons
Pros:
- High 13 GPM flow rate handles busy kitchen output with ease
- Large 25 lb capacity means less frequent maintenance
- Stainless steel body is rust-proof and extremely durable
- Top inlet design provides installation flexibility
Cons:
- Larger and heavier than smaller-capacity models
- Higher price point reflects the commercial-grade specs
Customer Reviews
Customer Review: “This is a beast of a grease trap. We installed it in our hotel kitchen and it handles everything we throw at it. The 13 GPM flow rate is no joke — our drains have never been cleaner. Worth every penny for a busy operation.”
Customer Review: “Upgraded from a smaller trap to this GarveeTech and the difference is night and day. We used to clean our old trap twice a week — now we go two to three weeks between cleanouts. The stainless steel build is top-notch.”
8. Stainless Steel Grease Trap Interceptor for Restaurant, Kitchen, and Cafe Wastewater
This stainless steel grease trap interceptor is a well-rounded option for restaurants, kitchens, and cafes that need dependable grease separation without overcomplicating things. At 13.9" x 9.9" x 9.8", it’s compact enough for under-sink installation while still providing effective grease capture. The thickened stainless steel body and dual drainage outlets make it a practical, no-fuss choice.
Key Features That Stand Out
- ✓ Thickened stainless steel body — durable, corrosion-resistant, and built to last
- ✓ Dual drainage outlets — both outlets are constructed with stainless steel for reliability
- ✓ Physical flow diversion and gravitational sedimentation — efficient grease separation through proven principles
- ✓ 1.5-inch drain outlet — standard size for easy plumbing integration
- ✓ Compact dimensions (13.9" x 9.9" x 9.8") — fits comfortably under most sinks
Why We Recommend It
Sometimes you just need a straightforward, reliable grease trap without any bells and whistles. This unit delivers exactly that. The stainless steel construction gives you peace of mind against rust, and the compact size means it’ll fit in almost any under-sink setup. It’s a solid all-rounder for any small to medium kitchen.
Best For
Restaurants, cafes, and small commercial kitchens looking for a compact, stainless steel grease interceptor that’s easy to install and maintain.
Pros and Cons
Pros:
- Stainless steel body resists corrosion and lasts for years
- Compact size fits in tight under-sink spaces
- Dual stainless steel drainage outlets add reliability
- Simple, proven separation technology
Cons:
- Smaller capacity may not suit high-volume kitchens
- No certification (ASME/PDI) mentioned, which may be required in some areas
Customer Reviews
Customer Review: “Simple and effective. We installed this under our cafe’s 3 compartment sink and it’s been working great for months. The stainless steel looks clean and professional. Easy to clean too.”
Customer Review: “Good grease trap for a small kitchen. It’s compact, well-built, and does what it’s supposed to do. We clean it every week or two and it’s kept our drains clear. No complaints.”
9. 30 LB Plastic Grease Trap for Under Sink Use in Restaurants, 38x33x33cm, Black
This 30 LB Plastic Grease Trap offers an impressive 30 lb capacity in a polypropylene body that will never rust. The stainless steel dense mesh filter basket is a standout feature — it captures solid waste and grease efficiently, keeping your drains clear. At 38x33x33cm, it’s sized to handle the demands of a busy restaurant kitchen with a 3 compartment sink.
Key Features That Stand Out
- ✓ 30 lb capacity — one of the largest in this roundup, reducing cleaning frequency
- ✓ Durable polypropylene construction — completely rust-proof and long-lasting
- ✓ Stainless steel dense mesh filter basket — captures solid waste and grease effectively
- ✓ Treats multiple oil types — handles mineral, animal, vegetable, mixed, and emulsified oils
- ✓ Compact under-sink design — fits in standard commercial kitchen setups
Why We Recommend It
The combination of a large 30 lb capacity and a stainless steel mesh filter basket makes this plastic grease trap a smart choice for busy kitchens. You get the rust-proof benefits of plastic with the filtration performance of steel. It’s a great value proposition for restaurants that want capacity without the weight of an all-steel unit.
Best For
Busy restaurants and commercial kitchens that need a high-capacity grease interceptor that’s easy to maintain and won’t corrode over time.
Pros and Cons
Pros:
- Large 30 lb capacity reduces maintenance frequency
- Polypropylene body is completely rust-proof
- Stainless steel mesh basket provides excellent filtration
- Handles a wide variety of oil types
Cons:
- Plastic body may not be as impact-resistant as steel
- Larger footprint requires more under-sink space
Customer Reviews
Customer Review: “The 30 lb capacity is a game-changer for our busy restaurant. We used to clean our old trap every few days — now we go a week or more. The mesh basket catches everything. Great product.”
Customer Review: “Love the plastic body — no rust worries at all. The filter basket is easy to remove and clean. We’ve had this for about four months and it’s been trouble-free. Good value for a commercial kitchen.”
10. Zurn GT2700 15 GPM Grease Interceptor with 2" No-hub Connection
Zurn is one of the most respected names in commercial plumbing, and the GT2700 is a testament to that reputation. With a 15 GPM flow rate — the highest on our list — this grease interceptor is built for the most demanding kitchen environments. The corrosion-resistant coated fabricated steel body, no-hub connection, and external vented flow control make it a professional-grade solution for any 3 compartment sink setup.
Key Features That Stand Out
- ✓ 15 GPM flow rate — the highest capacity on this list for the busiest kitchens
- ✓ Corrosion-resistant coated fabricated steel — built to withstand years of commercial use
- ✓ No-hub connection — simplifies installation with standard plumbing fittings
- ✓ Slip-resistant cover with 3/8" Allen bolt lift handle — secure and easy to access for maintenance
- ✓ Flow diffusing baffle and integral trap — maximizes grease separation efficiency
Why We Recommend It
When you need the absolute best in grease interception, Zurn delivers. The 15 GPM flow rate means this unit can handle anything a 3 compartment sink throws at it, even during peak service hours. The no-hub connection makes installation straightforward, and the overall build quality is exactly what you’d expect from a premium commercial plumbing brand.
Best For
Large restaurants, hotel kitchens, hospitals, and institutional food service operations that need a heavy-duty grease interceptor with the highest flow rate available.
Pros and Cons
Pros:
- Industry-leading 15 GPM flow rate for the busiest kitchens
- Trusted Zurn brand with decades of commercial plumbing expertise
- No-hub connection simplifies installation
- Heavy-duty coated steel construction for long service life
Cons:
- Premium price point reflects the commercial-grade quality
- Larger size may not fit in compact under-sink spaces
Customer Reviews
Customer Review: “Zurn makes the best commercial plumbing products, period. This grease interceptor handles our high-volume kitchen without breaking a sweat. The 15 GPM flow rate is exactly what we needed for our 3 compartment sink. Installation was a breeze with the no-hub connections.”
Customer Review: “We’ve had this Zurn trap in our restaurant for over two years now. It’s been rock-solid reliable. The build quality is excellent and it handles our peak-hour drainage without any issues. Worth the investment for any serious kitchen.”
Complete Buying Guide for Best Grease Interceptor For 3 Compartment Sink
Essential Factors We Consider
Choosing the right grease interceptor for a 3 compartment sink comes down to a few critical factors. First, flow rate (GPM) is crucial — a 3 compartment sink can produce a lot of wastewater quickly, especially during peak hours. You’ll want a unit rated for at least 7-10 GPM, though 13-15 GPM is ideal for busy kitchens. Second, grease capacity determines how often you’ll need to clean the trap. Larger capacities (20-30 lbs) mean less frequent maintenance. Third, consider the material — stainless steel offers the best durability and rust resistance, while high-density polyethylene is lighter and more affordable. Finally, check for certifications like ASME or PDI, as many local health departments require certified equipment.
Budget Planning
Grease interceptors for 3 compartment sinks range widely in price. Budget-friendly options like the John Boos GT-8 or the 4 GPM ASME Certified trap can be found at lower price points and work well for small operations. Mid-range options like the Gerrii 7.6 Gallon or BESEDER 10 GPM offer better capacity and features without breaking the bank. For high-volume kitchens, investing in a premium unit like the GarveeTech 25 LB or Zurn GT2700 makes sense — the higher upfront cost pays off in reduced maintenance and fewer drain problems. Always factor in the cost of regular cleaning and potential fines for non-compliance when setting your budget.
Final Thoughts
The best grease interceptor for your 3 compartment sink depends on your kitchen’s volume, space constraints, and local regulations. For most commercial kitchens, we recommend the Stainless Steel Grease Trap with 3 Inlets as our top pick because it’s specifically designed to handle multiple sink compartments. If budget is a concern, the John Boos GT-8 offers excellent value. For high-volume operations, the Zurn GT2700 with its 15 GPM flow rate is the gold standard. Whatever you choose, make sure it meets your local health code requirements and that you commit to a regular cleaning schedule — even the best grease interceptor won’t perform well if it’s not properly maintained.
Frequently Asked Questions
Q: What size grease interceptor do I need for a 3 compartment sink?
A: For a 3 compartment sink, you’ll generally need a grease interceptor with a flow rate of at least 7-10 GPM and a grease capacity of 15-25 lbs. The exact size depends on your kitchen’s volume. Busy restaurants should aim for 13-15 GPM units, while smaller cafes can get by with 4-7 GPM models. Always check your local plumbing code for specific sizing requirements.
Q: How often should I clean my grease interceptor?
A: Most manufacturers recommend cleaning your grease interceptor when it reaches 25% grease capacity. For busy kitchens, this might mean weekly cleanings. Smaller operations may only need monthly cleanings. Regular maintenance prevents clogs, odors, and potential health code violations. Setting a consistent cleaning schedule is key.
Q: Do I need an ASME or PDI certified grease interceptor?
A: Many local jurisdictions require ASME or PDI certification for grease interceptors in commercial kitchens. Even if your area doesn’t require it, certified units have been independently tested to meet performance standards, which gives you confidence in their effectiveness. It’s always a good idea to check with your local health department before purchasing.
Q: Can I use one grease interceptor for all three compartments of my sink?
A: Yes, absolutely. Many grease interceptors, like our top pick with three inlet ports, are specifically designed to handle multiple drain lines. You can either use a single high-capacity unit with multiple inlets or connect all three compartments to one interceptor through a manifold. Using one properly sized unit is often simpler and more cost-effective than installing three separate traps.
Q: What’s the difference between a grease trap and a grease interceptor?
We hope this guide helps you find the perfect grease interceptor for your 3 compartment sink. Remember, the right unit will save you money on plumbing repairs, keep your kitchen compliant with health codes, and make your daily operations run smoother. Don’t wait until you have a clogged drain or a failed inspection — invest in a quality grease interceptor today and keep your kitchen running clean!
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