Old Part Numbers: 68-4-21/8" male NPT x 1/4" compression adapter for air compressor unloader/bleeder line. A very common adapter to attach the 1/4" OD unloader/bleeder line from the unloader valve on the pilot valve to the pump head.

Includes all four (4) rings for the smaller, high-pressure (HP) piston (hone the cylinders before installation). For the B5000 and B5900 model air compressor pumps. If you have a sudden loss of performance or if the pump is using too much oil, replacing...

Screw that fastens the front and back of the belt  guard to each other, and to the compressor base. THD FORMING

Old Part Numbers: 5130940-00, SSF-8080-ZNFlange nut to attach the wheel to the air tank.

Includes all 3 rings for the larger, low-pressure (LP) piston for the B5900 air compressor pump. Hone the cylinders before installation.

Old Part Numbers: 5050400Graphite head gasket (in between the head and the top of the valve plate) for the B5900 air compressor pump. We recommend ordering the gasket kit, as it will save you money and will ensure that you have all of the head gaskets...

Gasket for bottom oil pan of air compressor pump. If the compressor pump doesn't seem to pressurize as quickly as it should or is leaking in between the head, valve plate, cylinder, or crankcase while running, there's a good chance you need to install...