Old Part Numbers: SSF-3158-1This is the screw that holds down the piston cover, on the top of the piston.

Air compressor check valve. 3/8" Comp x 1/2" MPT with 1/8" FPT side port.  The check valve is a one-way valve that prevents air from back-feeding from the air tank. If your unit has a hard time restarting when trying to cycle or your pressure switch...

Order this if ordering valve plate or a new head.

Old Part Numbers: AC-0558

Old Part Numbers: ST070387AV-MAT1/4-18 NPT x 2.5" pipe nipple for air compressors.Extra DetailsIf you have a Campbell Hausfeld/Husky model, this will fit the WL651001 model and many others.

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