O-Ring is the Chicago Pneumatic service part carried under part number R056605 (also carried as 3310104450). 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.
It shows up in the parts breakdown for the CP 1210 S SVR Paving Breaker and CP 1210 1210S 1210SVR Paving Breaker. 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 CP tool catalog 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: R056605
- Also listed as: 3310104450
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-R056605
- Listed on breakdowns for: CP 1210 S SVR Paving Breaker, CP 1210 1210S 1210SVR Paving Breaker

