• Prevents grease from entering plumbing and septic systems
  • 11-gauge cold rolled steel body
  • 20 GPM flow rate and 40 lb. grease capacity
  • 3" threaded inlet & outlet

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Length 24 Inches
Width 15 3/4 Inches
Height 15 Inches
Capacity 40 lb.
Flow Rate 20 GPM
Inlet and Outlet Size 3 Inches
Threaded Connections Yes


The Watts WD-20-THD 40 lb. grease trap with threaded connections prevents greasy substances from entering plumbing systems, septic fields, and wastewater treatment facilities where they cannot be processed properly and could harm the environment.

Grease traps like the Watts WD-20-THD are often used with cooking or prep sinks, pot sinks, and commercial dishwashers in various types of commercial food service operations.

The Watts WD-20-THD Grease Interceptor features a body constructed of 11-gauge cold rolled steel with an oven-cured, acid-resistant baked gray epoxy coating. Other standard features include a solid steel cover with gasket, a removable baffle assembly, a deep seal trap with cleanout, no hub connections, and an external cast iron flow control fitting (flow restrictor).

The Watts WD-20-THD grease trap has a grease capacity of 40 lb., and a flow rate of 20 GPM. It is PDI (Plumbing & Drainage Institute) Certified, and meets the industry and PDI Standard PDI-G101 for separation efficiency. This standard specifies that the grease trap must maintain 90% separation efficiency up to its rated grease retention capacity.

Overall Dimensions:
24"L x 15 3/4"W x 15"H
Flow Rate: 20 GPM (Gallons Per Minute)
Grease Capacity: 40 lb.
Threaded Inlet & Outlet Size: 3"

  • PDI Certified

    PDI Certified

    This item has been certified by the Plumbing and Drainage Institute (PDI), which promotes the advancement of Engineered Plumbing Products.

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Customer Reviews

  • Overall User Rating: Watts WD-20-THD 40 lb. Grease Trap with Threaded Connections

    5.0 stars from 2 reviews


    People Talk About:

    grease Trap need larger kitchen job installed fantastic fair ease
    0 out of 1 found this review helpful

    This larger grease trap does a fantastic job. I was amazed at how fair the shipping cost was, even though it weights over 80 pounds.

    from Gilpin Market Posted on

    0 out of 1 found this review helpful

    Grease Trap - I didn't want it, but if you have a kitchen, you will probably need it. Plumbers installed with ease. Haven't had to change it yet.

    from Topplez Corporation Posted on

    I sat clorox on top so has corroded top somewhat.

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