Why can’t a single hose regulator have the exhaust T replaced with the exhaust half of a double hose regulator with the opening secured to behind the head?There isn’t a single hose regulator that will not put bubbles in your face in some odd position, but a DH makes it nearly impossible. I rarely see bubbles with the D420 or any other reg. When I do it’s from moving into a position that puts my mask into the trouble zone, doesn’t happen often enough to be an issue, don’t seek faults, it may lead to less irritation
