I just got two tanks exchanged after not having oxygen for 2 years (long story).   I assembled the regulator onto a tank and the O2 is not pumping through the regulator and mask.  I can hear the O2 leaking out of the connection and am seeing 0 presssure on the gauge.

These tanks were newly filled and I do not see any damage to the regulator.   I tried the other tank with the same result so I can only assume there's an issue with the regulator.

I do not have pics of the connecting parts for a standard regulator, should there be a rubber ring between the regulator and the tank where the oxygen is released?   Any other thoughts?

I'm desperate to get this working as I am out of sumatriptan shots and with changes in my insurance I cannot afford refills at this time. 

Any guidance is greatly appreciated!   I think I may have to replace the regulator if I can find one locally today or be forced to order online.

Seal the tank valve  with the key and unscrew the regulator. It should unscrew easily by hand. Make sure no O2 is escaping from the tank.

Then replace the regulator, no more than hand tight and then open the tank valve. If you don't see the pressure register on the regulator I suggest you reseal with the key the valve and call the supplier.

If the regulator pressure guage is registering correctly you should be unable to loosen the regulator, as the pressure will seal it to the tank.

Hope that works. Let us know.

Best,  Peter.

My CGA-870 reg did the same thing and it's clear it was shot.  I bought a new one on Amazon Prime and bingo, i'm back in business.  I will say, it was obvious there was a leak internally because I could feel the O2 escaping.  Sometimes, that little brass and elastomer seal leaks as well. 

Chad

Yes there is a seal for the reg. Usually these stay on the reg but I've had them stick to the empty tank when changing tanks. Especially after extended time without changing.

Hope this helps.