O-Ring, Chicago Pneumatic part number 4700W65115, listed at Crowder Supply as CP-4700W65115. Seals like this one are consumables in a tool they are cheap, they age with heat and hours, and replacing the whole set during a teardown saves a second strip-down later.

The parts diagram hub is where to start if you are working back from a machine or send the model and serial and we will confirm it. Complete tools sit on the CP tool catalog. It ships out of Denver, same day on in-stock orders placed before 4 PM ET.

• Part number: 4700W65115
• Manufacturer: Chicago Pneumatic
• Crowder SKU: CP-4700W65115