Choosing a grease trap interceptor for a commercial kitchen comes down to one main question: how much water does your sink send down the drain, and how much grease-holding capacity do you need before the unit has to be opened? Install too small and you'll be cleaning it more often; choose a steel unit with a bigger grease rating and the upfront cost climbs. The four under-sink interceptors cover that range with two plastic separators, a mid-size steel unit, and a larger carbon steel model, with listed prices from $70.15 to $535.00.
Quick take
If you want a low-cost way to separate oil and water for a small kitchen or prep sink, the plastic interceptor is the least expensive entry point. If you want steel construction at a mid-range price, the Express KitchQuip unit offers a rated 4 GPM flow. For a higher-volume drain, the carbon steel unit is the top-capacity choice at the top of the price range.
Listed price comparison
| Product | Listed price | Relative price |
|---|---|---|
| 50L Grease Trap Interceptor (Listing 1) | $70.15 | |
| 50L Grease Trap Interceptor (Listing 2) | $70.15 | |
| 8lb Commercial Steel Grease Trap Interceptor - 4 GPM, PDI Approved | $269.95 | |
| Carbon Steel Grease Trap Interceptor for Restaurant Under Sink Kitchen | NSF | $535.00 |
Decision matrix
| Product | Best for | Watch out for |
|---|---|---|
| 50L Grease Trap Interceptor (Listing 1) | Compact kitchens that need a 50L/13.21 gal separator at 2.1 T/h | Plastic body and a focus on flow rate rather than a grease-pound rating |
| 50L Grease Trap Interceptor (Listing 2) | Same 50L capacity with assembly accessories in the package | Same plastic body and same flow rate as the first 50L unit |
| 8lb Commercial Steel Grease Trap Interceptor - 4 GPM, PDI Approved | Prep sinks that want steel construction and a 4 GPM flow rate | 8 lb grease capacity is smaller than the 30 lb model |
| Carbon Steel Grease Trap Interceptor for Restaurant Under Sink Kitchen | NSF | Higher-flow restaurant drains near 15 GPM | Highest listed price in the group |
50L Grease Trap Interceptor Oil-water Separator Restaurant Kitchen Under Sink
This is the lowest-price listing in the comparison. The spec set centers on a 50L/13.21 gal separator made of PP plastic with a top inlet and left outlet, a freestanding or under-counter mounting type, and a flow rate of 2.1 T/h. That makes it a direct fit for separating oil and water in kitchens, restaurants, fast food chains, bars, cafeterias, food factories, and schools. Choose it when the budget is the driving factor and the sink run is small enough to work with a 50L container. The limitation is that it is a plastic-body unit, so if you are looking for a steel interceptor with a grease-pound rating, this listing is not that.
50L Grease Trap Interceptor Oil-water Separator Restaurant Kitchen Under Sink (second listing)
This second 50L listing carries the same listed price as the first unit and the same core specs: 50L capacity, 2.1 T/h flow rate, top inlet, left outlet, and a PP plastic body in grey. What makes it a separate option is the package contents: the listing includes an oil-water separator, a drainage pipe, a pair of gloves, a sealing ring, and all accessories for assembly. If you are comparing the two 50L units and want the one that spells out the accessory kit, this is the listing to note. The limitation is the shared plastic body: the listed features center on capacity and flow rate, which fits a smaller kitchen drain rather than a heavy commercial grease load.
Carbon Steel Grease Trap Interceptor for Restaurant Under Sink Kitchen | NSF
At the top of the listed price range, this 30 lb unit is the one to look at when the kitchen drain runs closer to 15 gallons per minute. It is built from 11-gauge carbon steel with a corrosion-resistant coating, a T-vent, a non-skid deck plate, and removable baffles, so it is a heavier-duty build than the plastic units. For a restaurant under-sink installation that expects a 15 GPM flow rate, this unit is a direct capacity match. The limitation is the price position: it is the highest listed price in the comparison, so if the sink line only needs a few gallons per minute, the 8 lb steel unit can cover that at a lower cost.
8lb Commercial Steel Grease Trap Interceptor - 4 GPM, PDI Approved
This Express KitchQuip interceptor, listed as PDI approved, sits between the 50L plastic units and the 30 lb carbon steel model. It offers an 8 lb grease-holding capacity at a 4 GPM flow rate, with 17-inch length and 11-inch width noted for the unit. The steel construction is the main draw if you want something more durable than a plastic separator for a smaller commercial sink. The practical limitation is capacity: at 8 lb and 4 GPM it is scaled for a slower drain, so a high-volume kitchen line would make this unit fill faster than the 30 lb carbon steel model. Pick it when steel build and a moderate flow rate matter more than maximum size.
Final recommendation by use case
For a compact sink with a modest flow, the 50L plastic separator in either listing covers the basic oil-water separation job at the lowest listed price. For a steel body and a 4 GPM rating, the 8 lb Express KitchQuip unit is the middle-ground choice. For a restaurant drain that moves closer to 15 GPM, the 30 lb carbon steel interceptor gives you the highest capacity in this group, along with removable baffles and a T-vent.
