This is Chicago Pneumatic part number 3378512086 O-Ring, stocked at Crowder Supply as CP-3378512086. It keeps air or oil where it belongs inside the rock drill. Once it flattens or hardens, the machine loses pressure across the joint and performance falls off gradually rather than all at once.
The published breakdown lists it on the RDR 48R Rock Drill. Pull up the diagram and confirm the reference number for your serial before ordering.
Use the parts diagram hub to work through the rest of the assembly, or the CP tool catalog if you are pricing a replacement machine. Ships from our Denver warehouse; in-stock parts ordered by 4 PM ET go out the same day.
- Part number: 3378512086
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-3378512086
- Listed on breakdowns for: RDR 48R Rock Drill
