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I check the valves before and after submerging.......just because it makes me feel better about things. I know, compulsive...
righty tighty lefty loosey
Vindicator knob might be something to look into. Just a visual tool for an extra check, after you physically make sure the isolator is open.
You can't can't see the Vindicator on back mounted doubles when you're under water. You simply Must be able work the valves underwater without being able to see them. It's non-negotiable. If you "need" Da Vindicator, you need to NOT be diving back mounted doubles. I'm always solo fwiw.
VISUAL check before you get in the water
Why not? How does it hurt?Why?.... I'm going to check them, or turn them on, without being able to see them before I get in the water......is it something to do with "the redundancy of redundancy department?"
Nothing wrong with a visual check in addition to all the other things you do...but it surely ought to be secondary to an actual hands on check.