This is an authentic item which is supplied directly from the original equipment manufacturer for use with Bostitch air compressors. It is a high-quality replacement for a missing or worn gasket which helps to provide an air-tight seal for the plate head, please refer to the appropriate diagrams of your model for the correct location and ...Read moreapplication of this part. Over time the material may wear out and begin to crack eventually requiring a replacement. Keep in mind this gasket is made of durable composite material and is sold individually.