Old Part Numbers: 032-0091, 032-0072Oil sight glass w/ O-ring.

Ring Set for HP (small) piston.

Replace every 3-4 months if the air compressor is used frequently. A dirty filter can cause damage to the pump's valves, clog your check valve, and reduce the CFM output of the compressor. Always keep an extra handy!

If your valve is leaking on the side of the switch, do not order this part. Order check valve instead.