Leak at CO2 Regulator Nut

[FugacityBrews]

Just swapped an old CO2 tank out today for a new one and when I hooked up the regulator to the new tank and opened it up, there's a massive leak at the regulator nut assembly.

I disconnected the regulator, checked to make sure the washer was in good shape and that the nipple was well aligned with the tank fitting. I tightened everything back down and used a crescent wrench to make sure it was fully secured. Still leaking. I think I'm going to go get another washer tomorrow just to be sure, but I am out of ideas. The regulator sealed fine against the old tank, and I detached/reattached it several times without issue.

Any ideas as to what might be causing this would be appreciated! Pics attached.

 

[VikeMan]

It looks like your regulator has a "captive" rubber gasket. They can sometimes be a little finicky as they start to wear. I've used a couple of regulators with similar gaskets and they worked fine when the captive gasket was replaced by a standard non-captive nylon washer (the white kind with a ridge that seats in the ring on the tank).

 

[FugacityBrews]

It looks like your regulator has a "captive" rubber gasket. They can sometimes be a little finicky as they start to wear. I've used a couple of regulators with similar gaskets and they worked fine when the captive gasket was replaced by a standard non-captive nylon washer (the white kind with a ridge that seats in the ring on the tank).

I added a flat nylon washer to the mix and it solved the problem. Interesting that the captive one worked for my previous tank without issue, though. Thanks for the reply.

 

[day_trippr]

Some cga 320 valves have a circular relief cut into the valve face that can make mating up with a captive O-ring style coupler problematic. I've never had a problem adding a crush gasket when that happens...

Cheers!