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: 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...

This allows you to drain the oil from your pump.

Old Part Numbers: 9053853-NUNOTE: the end of this drain tube is threaded, so the drain plug can thread into the end of it.

Kit for one service on pump. Kit includes one plastic style air filter and 1 Qt. of 30W compressor oil. NOTE: Not for NS18S pump, which uses a different (round) air filter.

This handy maintenance kit includes one air filter element for the B3800/B4900 air compressor and one (1) quart of high-quality fully synthetic lubricant to keep your air compressor running like a champ! Replace the air filter every 3-4 months if the air...

Old Part Numbers: 9428080Aftercooler kit includes the Aftercooler and Gasket. NOTE: Does not include the bolts, order separately.

Old Part Numbers: 2236102115, 3600100, 3600181, 9428071For B3800 pump. Bolt and Washer included. 13.78" OD. Bore - 2.36”.