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Fit pump models: WVP5, WVP4, WVP3, WVP3A, WVP2, and the equivalent hardwired pumps: WH750, WH550, WH400, WH280, WH100 and other brand name pumps with 1/2 female NPT exhaust port. How it is Connected: This mini-Silencer comes with a 1/2 male NPT connector built at the silencer. so it will go directly to the 1/2 NPT female port. If your pump has a port bigger than 1/2, this silencer may not fit to that pump, even You try to adapt this to the pump because the pump has air flow rating, the max flow rate is about 12 CFM, any bigger pump may need a bigger silencer.