O RING 5140091-21

This replacement piston ring is a high-quality component which is supplied by the original manufacturer for use with a Porter Cable nailers. It is the o-ring that helps to create an air-tight seal for the piston, make sure to check appropriate diagram of your model for correct location and use of this part. Over time the material may begin to deteriorate and crack eventually requiring replacement to maintain peak performance. This part is made of durable rubber and it is sold individually.