Fill tank leaking air, help.

[Lobi]

I'd be surprised if a hardware store carried them.
A dive shop would probably.

Good thinking, thanks. I have a local dive shop that I've got air fills from. Wasn't going to go back there for fills because they only give me 3000psi in my 4500 tank. Was fine for the Armada but I just got a Hammer that wants 4500. Waiting for local paintball place to open back up for the season next month. Hoping they can do a 4500 psi fill. Local FD didn't want to touch it.

 

[Privateer]

You could probably get away with using a Buna 70 or 90 o-ring.
My setup uses those.
My local FD will fill as the Captain use to fill his Son's Paintball tanks. But I bought a compressor and fill my own now.