This is Chicago Pneumatic part number 470W253340 seal cover, stocked at Crowder Supply as CP-470W253340. Its job is to hold the pressure boundary between two mating faces; a hardened or nicked seal shows up as lost power and a damp housing well before anything else fails.

Matching it to a machine? Send us the model and serial and we will confirm the fit, or work back from the parts diagram library. Complete tools are on the Chicago Pneumatic tool range. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.

• Part number: 470W253340
• Manufacturer: Chicago Pneumatic
• Crowder SKU: CP-470W253340