O-Ring is the Chicago Pneumatic service part carried under part number 4700W65021, cross-referenced to 3081604974. It keeps air or oil where it belongs inside the tool. Once it flattens or hardens, the machine loses pressure across the joint and performance falls off gradually rather than all at once.
Matching it to a machine? Send us the model and serial and we will confirm the fit, or work back from the parts diagram hub. Complete tools are on the CP tool catalog. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.
- Part number: 4700W65021
- Also listed as: 3081604974
- Manufacturer: Chicago Pneumatic
- Crowder SKU: CP-4700W65021