I did an unplanned experiment in Feb on reg freeze ups. I was diving in Lake Winnippeaukee. The air temp was approx 10F. I am using two Odins, on an H-valve. One had been serviced the day before the dive, the other had approx 60 dives since service. The one with the dives on it froze, the freashly serviced one didn't. Out of curiosity, I serviced the one that froze. There was a small amount of water in the first stage. My point is, I think any Grade-A reg will be OK in ice diving service, BUT if there is any water at all in the first stage, you risk freeze up. Just my opinion, to muddy things up farther. Stephen Galperin
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