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I offer the following for two reasons: First, maybe someone else can learn from this experience, and second, I'd like to know how to avoid it in the future: I watched ScubaPro MK-20/D400's free flow three times this weekend. I don't mis-trust the regs. I'm pretty partial to ScubaPro. I'm just wondering about what the proper intermediate pressure should have been and why it's so hard to dial in. The fist free flow was on the surface in 42 degree F water. Air temp was in the fifties. When a local tech checked the intermediate pressure it was out of spec on the high end. He allowed the reg to stabilize for about two hours (apparently a necessary evil of the MK-20) and then adjusted the intermediate pressure down to 142 pounds. The next free flow occurred with a second MK-20/D400 at 60 feet and about 40 degrees F. I don't know the intermediate pressure of that reg. The third and final free flow was back on the original rig at 110' and 36 degrees. The second two free-flows occurred on the same dive. Thank God my buddy had doubles and I had a pony. He managed to safely shut down the MK-20 and switch to an Arctic, but when the MK-20 I was using failed and I switched to my G-200 at 110', that signalled the end to a doomed dive. I've read numerous messages recomending the MK-20/D400, and I'm planning on buying one, but I'm a bit leary now of set-up. Does anyone know the proper procedure for allowing the reg to stabilize before adjusting the intermediate pressure? For that matter, what's the proper intermediate pressure for depths between 90 and 140' at temps from 34 to 45 degrees F? I'm not a service tech myself, but I like to be informed before I buy. Thanks, Eric ericm@ru*.ne*
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