Old Part Numbers: A12467, N137875

Replace this seal when replacing the piston / cylinder kit, and if air is leaking from the head at the outlet.

Old Part Numbers: Z-A08548, Z-D29777Valve Plate Assembly, includes Valves and Cylinder Gasket (Head Gasket sold separately). Genuine Porter Cable replacement part. Broken valve causing slow pump up or no compression at all? Replace this valve plate kit...

Old Part Numbers: A19714, D27022Check Valve, 1/2" male NPT x 1/4" hose barb. If your compressor constantly leaks after it shuts off, this is probabably the problem. If this one-way check valve is clogged or defective, air will backfeed from your tank, so...

Cylinder gasket. This is the gasket in between the valve plate and piston/cylinder.