Best 50-Gallon Grease Traps for Commercial Kitchens
The best 50-gallon grease trap depends on whether you need a true tank-volume specification, a high flow rating, or a smaller commercial interceptor. QUARPAL and Generic list 50-gallon products, though QUARPAL’s description also says it holds up to 40 gallons. Canplas is a commercial alternative rated at 50 gallons per minute—not 50 gallons of storage. Wentworth and Zedfire are smaller-capacity alternatives for buyers comparing flow and grease-retention specifications.
| Product | Best For | Listed Specification |
|---|---|---|
| QUARPAL 50-gallon interceptor | Buyers seeking a steel under-sink unit | 20.32 GPM; description says up to 40 gallons |
| Generic 50-gallon separator | Buyers prioritizing threaded connections | 20.32 GPM; 56 lb product weight |
| Canplas thermoplastic interceptor | High-flow commercial kitchens | 50 GPM; 100 lb grease capacity |
| Wentworth interceptor | Higher grease-retention needs | 35 GPM; 70 lb capacity |
| Zedfire interceptor | Commercial sink and dishwasher setups | 25 GPM; 50 lb capacity |
QUARPAL 50-Gallon Carbon Steel Grease Trap
Best for: Buyers looking for a commercial under-sink steel interceptor with a listed 50-gallon size and a 20.32 GPM flow rate. The product description gives dimensions of 27.5 by 19.3 by 19.7 inches and highlights a dual-channel filtration pipe design.
Its Q235 carbon steel body has a rust-resistant coating, and the listing describes it as easy to clean. The combination of stated flow rate, under-sink format, and metal construction makes it a relevant option for restaurant, canteen, or home-kitchen comparisons.
Limitation: The listing is inconsistent about capacity: its name says 50 gallons, while its feature text says it holds up to 40 gallons. Confirm the required tank capacity and installation dimensions with the seller and local plumbing authority before choosing it.
Generic 50-Gallon Wastewater Separator
Best for: Buyers comparing a 50-gallon under-sink separator that lists threaded inlet and outlet connections. The product description states a flow rate of up to 20.32 GPM and gives a connection diameter of 1.89 inches.
The unit is described as carbon steel with a multilayer exterior coating. Its threaded connections and specified flow rate are useful details for planning a commercial kitchen installation, but the actual plumbing layout and connection requirements should be checked before purchase.
Limitation: The listing does not provide a grease-retention capacity in pounds or enough detail to establish compatibility with a particular local code. Verify those requirements before treating the stated 50-gallon size as sufficient.
Canplas Thermoplastic Grease Interceptor
Best for: Commercial kitchens where a higher listed flow rating is more important than matching a 50-gallon tank-volume description. Canplas lists this interceptor at 50 gallons per minute and 100 pounds of grease capacity.
The product information says grease interceptors connect to compatible outlet drains and use a screen that captures grease while wastewater passes through. This is a different specification profile from products described as 50-gallon tanks: GPM indicates flow rate, while pounds indicate grease capacity.
Limitation: This is not listed as a 50-gallon-volume unit. Confirm the required connection arrangement and sizing with a plumbing professional or local authority.
Wentworth 70-Pound Grease Interceptor
Best for: Buyers comparing commercial units by flow rate and grease-retention capacity rather than tank volume. Wentworth lists a 35 GPM flow rate and 70-pound grease capacity for restaurant and commercial kitchen wastewater applications.
The interceptor is made from 11-gauge carbon steel and has a powder-coated finish intended to help protect against corrosion and everyday wear. It may be a useful alternative when the project’s sizing calculations call for its stated flow and retention figures.
Limitation: The listing specifies pounds and GPM, not a 50-gallon tank volume. Do not assume that those ratings are interchangeable.
Zedfire 25-GPM Steel Grease Trap
Best for: Buyers who need a commercial interceptor specified for prep sinks, pot sinks, or dishwashers and want an included flow control. Zedfire lists a 25 GPM rating and 50-pound capacity, as well as a removable internal baffle for cleanout.
The listing describes a steel construction and says the interceptor is designed to capture fats, oils, and grease before they enter sewer systems, septic fields, or wastewater facilities. Its listed connection size is three inches and is described as non-threaded.
Limitation: It is a 50-pound, 25-GPM model, not a listed 50-gallon tank. Check the non-threaded connection details against the planned plumbing.
Buying Guide: How to Choose a 50-Gallon Grease Trap
Does “50” mean gallons, GPM, or pounds?
Read the complete specification before comparing models. Gallons may describe tank volume, GPM describes flow rate, and pounds describe grease-retention capacity. These measurements are not interchangeable. For example, Canplas lists 50 GPM and 100 pounds, while QUARPAL’s description uses a 50-gallon name but also states a 40-gallon holding capacity.
What flow rate does your kitchen need?
Estimate demand based on the connected sinks and equipment, then have the required interceptor size confirmed for the specific installation. A higher GPM rating does not by itself prove that a unit is suitable: connection size, configuration, and applicable local requirements matter too.
Which construction and maintenance features matter?
Steel models may include coatings intended to resist corrosion, while the Canplas listing identifies thermoplastic construction. Compare the material, access for cleaning, internal baffles or screens, and installation dimensions. A removable component can simplify access, but maintenance frequency and procedures should follow the product instructions and local requirements.
What should you verify before ordering?
- Confirm the required capacity using the correct unit: gallons, GPM, or pounds.
- Measure available installation space and check inlet and outlet specifications.
- Ask the local plumbing authority or a qualified installer about sizing and approval requirements.
- Check whether the product listing clearly supports the intended application and connection type.
Frequently Asked Questions
Is a 50-GPM grease trap the same as a 50-gallon grease trap?
No. GPM is a flow-rate measurement; gallons describe volume. A 50-GPM model does not necessarily have a 50-gallon tank.
What does a grease trap’s pound rating mean?
A pound rating describes listed grease-retention capacity. It is separate from tank volume and flow rate.
Is QUARPAL’s listed capacity 40 or 50 gallons?
The product name says 50 gallons, but its feature description says it holds up to 40 gallons. Confirm the intended capacity before purchasing.
Can any of these models be assumed to meet local code?
No. Product specifications alone do not establish suitability for every location. Verify sizing, connections, and local approval requirements with the relevant authority or a qualified plumbing professional.