Ordering by number: this is C085386 (also carried as 3310103716), the Chicago Pneumatic O-Ring. It seals a pressure joint inside the pump, and because elastomer takes a set long before the metal around it wears, it is one of the first items to replace when a machine starts weeping air or oil.
It is called out in the parts diagram for the CP 0020 Sump Pump. Pull up the diagram and confirm the reference number for your serial before ordering.
The parts diagram library indexes every breakdown we publish, and the Chicago Pneumatic lineup has the tools these parts go into. Stocked in Denver orders placed by 4 PM ET ship the same day when the part is on the shelf.
- Part number: C085386
- Also listed as: 3310103716
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-C085386
- Listed on breakdowns for: CP 0020 Sump Pump
