I just bought an old Healthways Scubair single hose reg and am curious as to what the snaps on a strap that is on the mouth piece are for. Retention or what. Very nice old reg that still works along with a Dacor first and second stage with an adaptor to run two hoses of one LP port. Working Dacor pressure gauge too. Tried to get a pic up but it is beyond my meager computer capabilities.