When a commercial sink is working through warewashing sanitation grease and foodservice oils, the interceptor underneath is what keeps the drain from fighting back. Two stainless steel units are on the table: the QX 8LB 5GPM Grease Interceptor at $51.97, and the Under-Sink Grease Trap at $49.03. Both aim to separate oil and water, but they lean in different directions.
Quick Verdict
Take the Under-Sink Grease Trap if you want the lower price. Choose the QX 8LB 5GPM Grease Interceptor if you want the explicit 8LB 5GPM designation and a unit that can be situated open-air or underground.
QX vs Under-Sink at a Glance
| Feature | QX 8LB 5GPM Grease Interceptor | Under-Sink Grease Trap |
|---|---|---|
| Price | USD 51.97 | USD 49.03 |
| Material | Stainless steel | Stainless steel |
| Dimensions | 13.8 x 7.9 x 7.9" | 13.8 x 9.8 x 9" |
| Water inlet | outlet | 48mm | 4.8cm |
The price gap between the two is only $2.94, so the decision is less about saving money and more about which set of specs fits your setup. The QX unit is the one calling out 8LB 5GPM, while the Under-Sink unit is sized by capacity.
Where Each Product Wins
The QX unit wins when you need the 8LB 5GPM rating and the flexibility to place the interceptor outdoors or underground. It also includes an automatic shut-off, oil drain, and sampling port, which are handy during maintenance. The Under-Sink unit wins on price and package contents, and it is built as a compact, durable, stable unit for under-sink use.
Product Notes
QX 8LB 5GPM Grease Interceptor
This is the unit to reach for when the grease load is varied. It handles mineral oil, animal oil, vegetable oil, mixed oil, and emulsified oils, so it is not limited to one kitchen scenario. It also includes an automatic shut-off, an oil drain, and a sampling port, which helps with maintenance. The package includes one interceptor with accessories as shown, and the unit can be arranged open-air or underground to prevent freezing. The main limitation is the price: it is the higher-priced of the two and offers a slimmer 13.8 x 7.9 x 7.9-inch footprint. If your space is tight, that compact profile helps; if you need more volume, the Under-Sink unit lists an 18-20L capacity.
Under-Sink Grease Trap
The Under-Sink unit is the price leader and the one that gives you a stated capacity. It lists 18-20L, and the package includes the interceptor, one drainage pipe, and one lid. The material is high-quality stainless steel, with a compact design and reliable construction. The 13.8 x 9.8 x 9-inch body is a bit taller and deeper than the QX unit, so it suits under-sink areas with more clearance. It also handles the same range of oily wastewater, including mineral, animal, vegetable, mixed, and emulsified oils. If a specific flow designation is essential, the QX version states it; if it is not, this unit gives you capacity and included hookup pieces instead.
Final Choice by Use Case
Choose the QX 8LB 5GPM Grease Interceptor when oil types vary and you want the 5GPM label plus the outdoor or underground option. Choose the Under-Sink Grease Trap when you want the stated 18-20L capacity, the lower price, and a stainless unit that comes with a drainage pipe and lid.
