CptTightPants21
Contributor
Why I went side mount.... I read way to many stories/articles/posts where a back mount diver thought they were out of air because of a roll off...
Not so much roll off as closed isolator. Although I did have my left post roll closed 3/4 of the way after doing a no mask drill through the lips at Ginnie.
The worst one, is when the isolator is closed and the shop fills from the left post. Full left tank tricks the SPG/diver into seeing full tanks, when they are really breathing a depleted right post. It is one of the reason I always give the isolator a little twist both ways during the predive check.