Screw, .250-20 x 1.25" U. This is one of the screws for the pump head; also used to attach the saddle mount cup/foot to the base of the pump.

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.

O-ring seal for air compressor valve plate, installs in between the cylinder and valve plate. Used with original style valve plate.SpecificationsO-ring measures 2.759"/2.719" ID