Ordering by number: this is 3371821216, the Chicago Pneumatic Piston 21 HBP-NC. It is the breaker piston that strikes the working tool.
You will find it on this Chicago Pneumatic BRK 55 parts diagram: 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: 3371821216
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-3371821216
- Listed on breakdowns for: CP BRK 55 – Breaker – BRK 55 HBP & BRK 55 VR HBP
