Atomic B2 intermittent first stage HP port leak

[MacLir]

Hi all. I recently had my Atomic B2 environmentally sealed by a local authorized dealer. I witnessed the leak test in the shop. No leaks. Today, when pre-testing gear before a trip, I hooked the reg to my tank (HP 100) and noted a very clear and significant leak around the HP port to which my gauges are connected. This leak reoccurred consistently and also occurred on the other HP port when I connected my gauges to it. There is no leak when the plugs are in both ports. I then checked the gauge by connecting to a different first stage and no leaks developed after multiple attempts. I next brought the Atomic reg to the dealer. On testing, we noted a sharp sucking noise initially at the HP port, followed by no leaks after multiple tests. The tech found no problems. On bringing the reg home, I hooked it up again, heard a short leak which resolved. On retest, I have found that a consistent unresolved leak occurs about 4 out of every 5 times I pressurize the reg; the balance of the time, there is either a short sound or a couple second long leak which resolves completly. The only other detail I have noticed is that the black gasket encircling the first stage has become concave (it was flat before). I am a bit mystified as to what might be going on here, wondering whether anyone here might have any ideas?

Thanks!

 

[tbone1004]

replace the hose O-ring on the HP hose, or the entire hose. Problem solved. This should have been part of your service btw, the parts kits come with new O-rings for all blanking plugs which means every plug o-ring gets replaced, and every hose o-ring gets replaced. Find a new service center.