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

Must order quantity of 4 for complete set. 

New style filter assembly with 3/8" threads. Includes new style air filter, head, and o-ring. Note: Do NOT order if your head has 2 holes on the SAME side of the head. This head has 3/8" FPT threaded ports on both sides. If your head has a 3/8" port...

Old Part Numbers: Z-AC-0032, AC-0032Valve plate comes with preinstalled valves and o-rings. Poor performance or air leaks out of the intake filter while the unit is running? This is probably the problem.

There are several different air compressor cooling fan styles. Choose this if yours looks like this one. Replace if cracked or missing fins.