This item is a genuine Chicago Pneumatic replacement part that has been sourced from the original manufacturer. The metal spring is used with pneumatic ratchets. This item is part of the throttle valve assembly and is used to provide compression for the valve when the throttle button is pressed. This item is available as an individual replacement part.

Genuine Chicago Pneumatic replacement part, this item is sold individually.
This part acts as as a seal so that air will not leak out of the throttle assembly on the tools shown below.
Over time it will become brittle and crack.
It is a good Idea to keep an extra one on hand.

This is a manufacturer sourced replacement part designed for use with Chicago Pneumatic ratchet/wrenchs. This o-ring provides an air-tight seal for the valve. Over time this o-ring will shrink, become brittle and crack allowing for air leaks. At that time it should be replaced. It is made out of rubber and it is sold individually.

Replacing this item you would need hex key/allen wrench and pliers to replace this item.