DeWalt Bostitch Nailer Black Rubber O Ring DPN64C N66BC N66C N66FH

DeWalt Bostitch Nailer Black Rubber O Ring DPN64C N66BC N66C N66FH

This O Ring sits above the driver and creates a seal between the cylinder and collar to stop any leaks of any grease, you would need to replace this if you notice any leaks as over time O Rings will perish and deteriorate.

Please see below applicable models