Choosing the right warewashing sanitation grease interceptor is a decision about trade-offs. You need something that catches grease before it reaches the drain, but it also has to fit your sink cabinet, handle your water flow, and stay within your equipment budget. Two under-sink units offer very different answers: one is a compact metal interceptor with accessories included, the other is a larger plastic oil-water separator built for higher-volume kitchens. The right choice comes down to how much water your kitchen pushes through per hour and how much treatment you want to do at the sink.
Quick verdict
For a one-and-done install with included fittings, the 20 LB Grease Trap is the more feature-complete option. For heavy-volume kitchens that want to move a lot of water without spending as much, the 50L Grease Trap is the practical pick. The 50L separator also keeps your initial outlay lower, while the 20 LB unit delivers more mechanical separation and a fuller set of included parts.
Comparison
| Feature | 20 LB Grease Trap Grease Interceptor Trap 4 Layer filter Interceptor Trap US | 50L Grease Trap Interceptor Oil-water Separator Restaurant Kitchen Under Sink |
|---|---|---|
| Price | USD 130.90 | USD 70.15 |
| Capacity | 20 lb rating | 50L / 13.21 gal |
| Flow rate | 0.51 m³/h / 2.2 GPM | 2.1T / 4629.71 lbs/h |
| Material | 201 stainless steel, alloy, brass, plastic with steel wire | PP plastic |
| Filtration | 4-layer filter | Oil-water separation |
| Layout | Under-sink, side water inlet | Freestanding or under countertop, top inlet / left outlet |
Where each product wins
The 20 LB grease trap wins if you want a unit that includes the essential fittings. The lid, pipe, oil drain valve, and installation accessories are all in the box, so you are not sourcing separate parts. It also suits a sink cabinet where a side inlet works better than a top drop.
The 50L separator wins if your kitchen handles continuous wastewater flow. It is built for restaurant or cafeteria sinks that stay busy throughout a shift. The rectangular tank fits easily under a counter.
Product notes
20 LB Grease Trap Grease Interceptor Trap 4 Layer filter Interceptor Trap US
This unit is built to be a self-contained under-sink system. The box includes the grease interceptor, a lid, a filter basket, a pipe, and an oil drain valve, along with the accessories needed for installation. For a kitchen setup that prefers to have everything on hand before starting, that means fewer separate trips for parts. The 4.8cm/1.9in water inlet and outlet set the pipe sizing for the connection, and the included 80cm/31.5in hose gives you some positioning freedom under the sink. The main drawback is that inlet diameter: if you need a larger direct hookup, you will need to plan your connection carefully. If that fits your plumbing, the 20 LB unit gives you a turnkey grease-handling package.
50L Grease Trap Interceptor Oil-water Separator Restaurant Kitchen Under Sink
This separator is all about volume. The 50L/13.21gal tank accepts a heavy amount of wastewater, and the flow rate of 2.1T/4629.71lbs/h is far higher than the typical under-sink trap. Water enters through a top inlet and exits from a left outlet, with a 78cm/30.71in drainage pipe included to bridge the gap to your drain line. It works freestanding or under a countertop, so you are not locked into a permanent mount. The reason to choose it is that it can keep pace with a busy restaurant or cafeteria sink without choking. The limitation is that you will need to assemble it before first use, and the top-inlet/left-outlet design affects how you position the tank in your cabinet.
Final choice by use case
If your kitchen runs lots of water through a single prep sink, the 50L Grease Trap is the sensible buy. Its tank size is aimed at continuous use, and the inlet design is straightforward for most drain hookups.
If you prefer a unit that comes ready to install, the 20 LB Grease Trap is the better match. It brings more of the parts you need in the box, so the installation is less of a scavenger hunt.
