I have read a little about divers who use a long hose regulator setup. My understanding is the you primary 2nd stage is on something like a 5'? hose and the secondary 2nd is on a 20 something in. hose. You donate you primary in an ooa emergency and you use your secondary 2nd stage. My first question is how long should a long hose and short hose be, and of more interest to me, where the ...


