Three places I'd check (2 already covered: mouth piece, tie wrap, & or splits.cracks)
The diaphragm, tight, sealed or possible small tear) 3rd is exhaust flap/valve.
I don't know how old the reg is, but these can dry & curl with age, & should be replaced if not seating properly.
regards
Mike D
The diaphragm, tight, sealed or possible small tear) 3rd is exhaust flap/valve.
I don't know how old the reg is, but these can dry & curl with age, & should be replaced if not seating properly.
regards
Mike D