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What is the correct procedure for shutting down manifold valves on a set of 
doubles  when you hear air leaking from behind your head and without your 
buddy close at hand to determine if it's a tank O ring or hose leak?
 
A. Isolation valve first, then right or left valve depending on side you 
think air is flowing from? If it's a tank O ring this will save some air. I 
have read this.
 
B. Right or left valve and if sound continues then turn isolation valve off? 
I Have been taught this in a cave course. Any replies would be appreciated 
but please no song and dance about where's my buddy and changing O rings 
before every dive
BOB.  
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