Choosing the right under-sink grease interceptor for a commercial kitchen comes down to two questions: how much wastewater your sink sends down the line, and how much space you have to work with. It's a warewashing sanitation grease decision that affects how often you service the unit, how quickly wastewater flows through, and how much you pay upfront. Some kitchens only need a small unit that captures grease from a single prep sink. Others feed a busy line that runs during peak meal periods, so they need more capacity and a higher flow rate to keep drainage moving.
Quick verdict
If your priority is keeping the upfront cost low and your sink sees light to moderate use, the smaller steel interceptor is the easy pick. It handles the basics without a big footprint. If you're running a restaurant under-sink kitchen with heavier flow, the larger carbon steel unit is the better match. Its bigger capacity means fewer cleanouts during a busy shift, and the extra service features make maintenance simpler.
At a glance
| Feature | 8lb Commercial Steel Interceptor | Carbon Steel 30lb Under-Sink Unit |
|---|---|---|
| Listed price | USD 269.95 | USD 535.00 |
| Capacity | 8 lbs | 30 LB |
| Flow rate | 4 GPM | 15 GPM |
| Material | Steel | Carbon steel |
| Key extras | Compact 17x11-inch footprint | No-hub connections, T-vent, non-skid deck plate, removable baffles |
Where each wins
The smaller unit wins on price and fit. It costs less, needs less space under the sink, and is a smart option when you're outfitting a single prep sink or a small café. The larger unit wins on workload. With a higher flow rate and more holding capacity, it can keep up with a busy restaurant sink line. It also includes removable baffles, a non-skid deck plate, and a T-vent, which are practical touches for kitchens that run multiple service periods a day.
Product notes
8lb Commercial Steel Grease Trap Interceptor
The 8lb Commercial Steel Grease Trap Interceptor from Express KitchQuip is the model to choose when you want a straightforward, lower-cost unit that still gets the job done. It's built with a steel body and is a PDI-approved model. The compact footprint makes it easier to squeeze into tight under-sink spaces than a larger trap, and the 17-by-11-inch dimensions give you a clear idea of the space you need. For light-to-moderate foodservice use, its 4 GPM flow rate keeps wastewater moving while capturing grease and solids. The main trade-off is that the smaller holding capacity means you'll empty and clean it more often than you would with a bigger unit. If your sink line doesn't run constantly, this steady performer offers a practical balance of cost and function.
Carbon Steel Grease Trap Interceptor (30 LB)
For a restaurant under-sink kitchen that handles a high volume of wastewater, the Carbon Steel Grease Trap Interceptor for Restaurant Under Sink Kitchen is the heavier-duty option. It's constructed from 11-gauge carbon steel with a corrosion-resistant coating, which is a good fit for a busy kitchen environment. The unit comes with no-hub connections, a T-vent, a non-skid deck plate, and removable baffles. Those extras make routine maintenance easier: the baffles can be taken out for cleaning, and the non-skid deck plate adds safety in a wet workspace. The 15 GPM flow rate is designed for busier sink lines, so it can keep up with peak meal periods without slowing down. The trade-off is the higher price and a bulkier footprint that needs more room under the sink. If your layout can handle it, the extra capacity and included service features make this the more capable unit.
Final choice by use case
If your sink sees steady but not constant use, the Express KitchQuip interceptor at $269.95 is the practical choice. It covers the essentials without pushing your budget. If you expect heavy flow during peak periods, the NSF carbon steel unit at $535.00 is the one to budget for. You pay more upfront, but the larger capacity and higher flow rate are designed for that kind of demand.
