If you have a leaking fill nipple (also called foster fitting) on your high pressure air tank, the most likely culprit is a worn out or damaged fill nipple o-ring. Captain O-Ring's ten (10) pack of polyurethane fill nipple o-rings ensures you aren't left at the field with a leaking fil nipple, while also having spares on hand for future repairs and friends/teammates.

To check compatibility: Empty your air tank entirely, remove the fill nipple from the tank/regulator, remove the piston (you may have to poke it out from the fill side opening with something narrow) and check if the o-ring is a size 006.

To Install: Empty your air tank entirely. Remove the fill nipple from the tank/regulator. Remove the piston from the fill nipple (you may have to poke it out from the fill side opening with something narrow, be sure to note which direction it faces). Remove the old o-ring. Install the new o-ring. Replace the fill nipple piston (make sure it faces the same direction as it was removed). Install the fill nipple onto the tank/regulator. Fill the tank and ensure no leaks.

Note: Do not lubricate the o-ring with oil during installation. Under high pressure, oil may reach its flash point and ignite/combust.

What to expect: Includes ten (10) polyurethane fill nipple o-rings in Captain O-Ring branded packaging.