Replacing the o-rings in your Benjamin / Air Force PCP Hand Pump has never been easier. With Captain O-Rings printable o-ring replacement guide, simply size up o-rings with the guide and replace with the sizes indicated in the guide. This drastically reduces the time and effort spent rebuilding your pump.
The printable o-ring replacement guide is available at CaptainOring.com/manuals
Includes Nitrile Butadiene O-Rings and one 90 durometer Polyurethane piston o-ring. The piston o-ring is the most crucial seal in the pump, and the one that faces the highest stress and abrasion. Black buna o-rings often fail prematurely in this application due to the high heat and abrasion faced when pumping the piston. The polyurethane piston o-ring ensures lasting performance of this critical o-ring.
What to expect:
This item includes a full rebuild of O-Rings (as pictured) in a resealable zip-top poly bag with "Captain O-Ring" branded packaging.