The shop that has serviced my regs in the past has a policy that the reg owner gets a free post service pool practice session to check things out.
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I have heard of 1st stage issues after flight, supposedly caused by some kind of internal pressure differential occurring if the dust cover is on tight. I have never seen or experienced it myself but would believe this more than a 2nd stage diaphragm moving.
1) Ever hear of a second stage malfunction due to airline flights?
2) Ever heard of TSA agents disassembling a second stage, either for:
A) Stealing titanium?
B) Searching for contraband?
Inquiring minds and all, thanks for the info in advance!
You can do the above test without attaching the reg to tank. You just need to make an air-tight seal over the first stage orifice. A properly placed thumb or an air-tight dustcap would do the trick.By the way there is a simple check you can do to verify the diaphram is seated. Attach your regulator to a tank that is turned off. With the second stage in your mouth inhale. You should feel the vacuum, and it should not leak down over time. If it does you've got a leak. Of course the shop really should test your regulator after putting it back together. Sadly that seems not to happen fairly often.