Ordering by number: this is 3371815735, the Chicago Pneumatic Back-Up Washer. It supports an O-ring or seal so it does not extrude under pressure.
You will find it on 2 Chicago Pneumatic BRK 55 parts diagrams: CP BRK 55 – Breaker – BRK 55 & BRK 55 VR; CP BRK 55 – Breaker – BRK 55 HBP & BRK 55 VR HBP. Check it against the reference number on the diagram first; serial breaks change what fits.
The parts diagram library indexes every breakdown we publish, and the Chicago Pneumatic tool range has the tools these parts go into. Ships from our Denver warehouse; in-stock parts ordered by 4 PM ET go out the same day.
- Part number: 3371815735
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-3371815735
- Listed on breakdowns for: CP BRK 55 – Breaker – BRK 55 & BRK 55 VR; CP BRK 55 – Breaker – BRK 55 HBP & BRK 55 VR HBP
