Herman ;
dust caps are not engineer with the tolerances of the tanks or made out of a rigged material like metal. they are dust caps.
as I have stated, I have seen the scaring inside the first stage of some customer regs who have a habit of putting on the dust cover and then dunking the regs at the dockside dunk tanks or out home to clean them.
it's a bad habit if not pressurized, it will effect the fist stage and second stage and over time they will need to be replaced.
this has become a religious discussion, so rather than keep ratcheting it up. this is my final post on this thread.
T.
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No need for the connections to be metal for such low pressures...although one of the ones we are talking about is metal...the exact same one, the reg. There are plenty of non metal oring sealed surfaces used in diving....computer batteries, camera housing and lights to name a few. All of those handle much greater pressure differentials. Tolerences are not an issue, the gland in the dust cap is plenty close for such a small pressure differential....I machine that type of seals all the time.