Old Part Numbers: PSMDR21130Air compressor pressure switch, 100 PSI cut-in / 130 PSI cut-out, 4 port, MDR21-style with 90-degree quick-connect unloader valve and auto on/off lever. Replace the pressure switch if the compressor no longer cuts in or out at...

Old Part Numbers: 4116091337Complete B3800 replacement air compressor pump assembly includes flywheel, sight glass, oil breather, and air filter (no aftercooler). 3 - 5 HP. Note: This pump has a LEFT-side discharge. If your discharge tube connects to...

NS18S Air Compressor Pump Replacement, Complete Assembly with Aftercooler, Single-Stage, 3 - 5 HP. Same as B3800 except it includes aftercooler and flywheel. Aftercooler must be used.   Important: This pump has a LEFT-side discharge. If...

Old Part Numbers: ST119301AV, QR1/8" NPT x 1/4" nylon tube. This allows 1/4" nylon tubing to push to fit into this fitting. The 1/8" MPT threads screw into the unloader area of the air compressor check valve.

Old Part Numbers: 6211848600Air compressor flywheel bolt, M8x30mm left-hand thread.

Old Part Numbers: 9428120Piston ring and gasket set for the B2800 / B3800 / NS18S air compressor pump. NOTE: Includes rings for both pistons.

Old Part Numbers: 1312100119Replacement B2800 pump with RIGHT-hand discharge. Inline twin-cylinder, single-stage, aluminum w/ steel sleeves. 10 CFM @ 1,400 Max RPM. If your discharge is on the left side, you will need to flip the valve plate and...

Old Part Numbers: 9428060Head kit for the B2800 and B3800 in-line, twin-cylinder air compressor pumps. Includes the head and head gasket. Remember to tighten the bolts down to the proper torque specs as noted by the manufacturer.