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xerxes once bubbled...
Directly after i finished my OW course i dove with a friend. It was about 7 degree's (celcius i think) and not very light. Guess what? Freeflow, man scared the SH*T out of me.... Just finished my OW course! I was scared as hell.. you know the sound of a freeflow? You dont wanna know? Best chance is to get a reg. that is specially designed for cold waters.. Apeks for instance. There are others but now i know more on reg's. I like the apeks. I service them my self (with the help of a friend by the way, i am still relatively new).
BTW: just buying a good reg is no gaurantee against freeflow ... good maintainance, proper handeling, pressure settings etc...