This guide separates three current Watts document families—WD, WD-A and GI-K—so their names and specifications are not mixed. It does not choose a restaurant size, predict installed cost or replace the exact product sheet and local project review.
How the current Watts families differ
WD floor-mounted and recessed interceptors
Watts describes the WD family as epoxy-coated steel hydromechanical grease interceptors with flow control, an internal baffle, deep-seal trap, gasketed cover and no-hub connections. Those features belong to the documented WD family; they should not be generalized to every Watts interceptor.
WD-A semi-automatic draw-off
The current Watts WD-A material calls this a semi-automatic draw-off series. Use the exact WD-A model record for its capacity, connection, draw-off procedure, placement and maintenance. It should not be compared as though it were a fully automatic skimming system.
GI-K larger-capacity models
The current GI-K specification lists models from 75 through 500 GPM. It identifies GI-75-K at 75 GPM with 150 lb grease capacity and GI-100-K at 100 GPM with 200 lb grease capacity. The same sheet gives the GI-75-K dimensions as 39.75 × 30.75 × 23 inches. These values apply to the named GI-K models, not to WD products.
Verified model examples
| Exact model | Current documented rating | Use of the figure |
|---|---|---|
| WD-20 | 20 GPM; 40 lb grease capacity. | Confirm the current WD product document and connection before specification. |
| WD-50 | 50 GPM; 100 lb grease capacity; 4-inch no-hub connection. | Do not infer a restaurant type or required size from GPM alone. |
| GI-75-K | 75 GPM; 150 lb grease capacity. | Use GI-K dimensions and installation instructions for this exact model. |
| GI-100-K | 100 GPM; 200 lb grease capacity. | Keep the “-K” suffix in plans, quotes and submittals. |
Selection and installation checklist
- Obtain the sizing method accepted by the authority and project designer.
- Choose the Watts family only after flow, grease capacity, material, placement and operating method are defined.
- Match the complete model name and suffix across the quote, product sheet, plan and submittal.
- Verify connections, dimensions, access, flow-control components, cover and maintenance procedure in current documents.
- Confirm local requirements for plans, permits, venting, sampling, installation and inspection.
Pricing and maintenance boundaries
Manufacturer list prices are not installed prices. This guide deliberately omits national price bands because freight, availability, accessories and site work vary. Request a dated, itemized quote for the exact model.
Service frequency must be established for the selected unit and real kitchen loading. Follow the model instructions, document measured accumulation and comply with the authority's current requirements rather than applying a universal percentage or calendar interval.
Frequently Asked Questions
Is the Watts WD-A series automatic?
Watts identifies WD-A as a semi-automatic draw-off series. Do not describe it as a fully automatic grease-removal system.
What is the difference between WD and GI-K product documents?
They are separate Watts product families. WD documents cover floor-mounted or recessed hydromechanical interceptors, while the GI-K specification lists larger 75–500 GPM models. Do not transfer dimensions or ratings between families.
Is the 100 GPM model called GI-100?
The current Watts specification uses GI-100-K. The suffix matters because it identifies the documented product family and avoids mixing it with another or older configuration.
How much does a Watts interceptor cost installed?
This guide does not publish a national installed price. Obtain a dated quote for the exact product, freight, accessories, site work, plumbing, permits and inspections.
How often should a Watts interceptor be serviced?
Use the exact model instructions, measured site loading and local requirements to establish the schedule. A fixed national 30–90-day interval is not supported for every Watts model and kitchen.
Official sources
- Watts — WD grease-interceptor family
- Watts — WD-50 product record
- Watts — WD-A semi-automatic series
- Watts — GI-K specification
- Watts — grease-interceptor installation instructions
Fact-checked August 12, 2026. Verify the complete current model designation and project requirements before purchase.
Author: Grease Trap Locator Editorial Team
The Grease Trap Locator editorial team covers FOG compliance, grease trap maintenance, and commercial kitchen regulations across the US and Canada. Our guides are written for restaurant owners, facility managers, and food service operators who need practical, accurate information without the fluff.
Find local contractors who handle cleaning, pumping, and FOG compliance — in your area.