Rockford RGI-350 Gravity Grease Interceptor – 350 Gallon, 1,764 lb. Capacity, H20 Load Rated
Rockford RGI-350 Gravity Grease Interceptor — 350 Gallon, 1,764 lb. Capacity
The Rockford Separators RGI-350 is a large-format, all-welded steel gravity grease interceptor sized for hotels, multi-unit restaurants, institutional kitchens, and any commercial facility producing more grease than a PDI-style under-sink trap can keep up with. With a 350-gallon liquid holding capacity, 1,764 lb. greasy sludge capacity, and a flush-with-grade cover rated for heavy truck traffic, it is engineered to sit between the kitchen and the sanitary sewer for decades of buried or above-ground service.
Key Features of the RGI-350
The RGI Series is Rockford Separators' large-capacity gravity-based platform — built in Rockford, Illinois for facilities that need real grease retention, not just a sink-level trap.
350-Gallon Liquid Holding
Long retention time gives grease the dwell to separate from wastewater by gravity — the physical principle behind every effective interceptor, scaled up for high-volume operations.
1,764 lb. Grease Storage
Captures and holds over 1,700 pounds of greasy sludge between pump-outs, dramatically extending service intervals compared with small under-sink traps.
H20 Heavy Truck Traffic Rating
The 3/8" nonskid diamond treadplate cover is rated for H20 loading — safe to install flush with grade in parking lots, loading docks, and service drives where commercial vehicles roll directly over the unit.
All-Welded Steel + Bituminous Coating
Continuous-weld steel body with bituminous coating inside and out, factory-tested heavy-duty leak-proof gasket, and stainless steel flat-head screws on the cover — built to survive decades of buried service.
4" Threaded Inlet & Outlet
4-inch threaded connections handle discharge from multiple commercial kitchen fixtures simultaneously without choking flow at the inlet.
6" Standard Manway (Customizable)
Ships standard with a 6" tall manway for service access — specify a taller manway when ordering if the unit will be buried deeper or installed under a paved overlay.
Custom-built, non-returnable: The RGI-350 is fabricated to order. Confirm capacity, manway height, and pipe configuration against your spec sheet and local code before placing the order — returns are not accepted on custom units.
Ideal Applications
The 350-gallon class is the sweet spot for mid-to-large commercial kitchens that have outgrown PDI under-sink traps but do not yet need a 1,000+ gallon tank.
RGI-350 Specifications
| Brand | Rockford Separators |
|---|---|
| Model | RGI-350 |
| Series | RGI Series — Gravity Grease Interceptor |
| Liquid Holding Capacity | 350 gallons |
| Greasy Sludge Capacity | 1,764 lb. |
| Inlet / Outlet Connection | 4" threaded |
| Manway | 6" tall (standard — customizable height on request) |
| Width (E) | 42" |
| Length (F) | 48" |
| Height (G) | 54" |
| Top to Center of Outlet (A) | 18" |
| Top to Center of Inlet (B) | 16" |
| Bottom to Center of Outlet (C) | 42" |
| Bottom to Center of Inlet (D) | 44" |
| Shipping Weight | 1,200 lb. |
| Construction | All-welded steel, bituminous coating inside & outside |
| Cover | Removable 3/8" nonskid diamond treadplate, stainless steel flat-head screws |
| Gasket | Heavy-duty leak-proof |
| Load Rating | H20 — heavy truck traffic |
| Installation | Flush-with-grade or above-ground |
| Country of Origin | Made in USA — Rockford, IL |
| Order Notes | Custom-built to order — non-returnable; confirm spec sheet before purchase |
Frequently Asked Questions
What is a gravity grease interceptor?
A gravity grease interceptor relies on dwell time and the density difference between water and grease to separate them. Wastewater enters one side, slows down across the large internal volume, and grease floats to the top while heavier solids settle to the bottom. The cleaned water flows out to the sanitary sewer.
What's the difference between the RGI Series and the RP Series?
RP Series traps are small PDI-G101 rated grease interceptors sized in pounds-of-grease and GPM flow — typically installed under a single sink. RGI Series interceptors are large gravity-based tanks rated in gallons of liquid holding, sized for an entire kitchen or multiple kitchens feeding one unit.
Can the RGI-350 be installed in heavy truck traffic areas?
Yes. The 3/8" diamond treadplate cover is H20 load rated, which is the standard used for installations under highway and commercial truck loads. This makes the unit suitable for flush-with-grade installation in parking lots, loading docks, and service drives.
Is the RGI-350 returnable if I order the wrong size?
No. The RGI-350 is custom-built to order, so it is non-returnable. Verify the capacity, manway height, pipe configuration, and your local plumbing code with your engineer or plumbing inspector before placing the order.
What is the manway height on the RGI-350?
The standard configuration ships with a 6" tall manway, which works for shallow installations. If the unit will be buried deeper or installed under a paved overlay, specify the manway height you need at the time of order.
How often does the RGI-350 need to be pumped out?
Pump-out frequency depends on grease loading, kitchen volume, and local code, but the common rule of thumb is to clean before grease reaches 25% of the storage capacity — roughly 440 lb. on a 1,764 lb. capacity unit. Most jurisdictions also require periodic cleaning regardless of fill level.
| Brand | Rockford Seperators|Grease Traps |
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| SKU | RGI-350 |
| Brand | Rockford Seperators|Grease Traps |
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