This is Chicago Pneumatic part number C085385, which also shows up as 3310103715 O-Ring, stocked at Crowder Supply as CP-C085385. 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.
Crowder’s breakdowns list this part on the CP 0020 Sump Pump.
The rest of the assembly is on the same breakdown, and every diagram we publish is indexed on the full diagram library. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: C085385
- Also listed as: 3310103715
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-C085385
- Listed on breakdowns for: CP 0020 Sump Pump
