O-Ring is the Chicago Pneumatic service part carried under part number P155584. 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 is called out in the parts diagram for the CP 4129 Chipping Hammer. Worth matching the reference number on the diagram against your own machine before you order the same part number can sit in more than one position.
If you need the parts around it, the parts diagram hub has the full breakdown library, and the Chicago Pneumatic tool range covers the machines themselves. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: P155584
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-P155584
- Listed on breakdowns for: CP 4129 Chipping Hammer
