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https://www.gardenspareparts.co.uk/
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