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Hi Everyone,

    I went diving in the St Mary's River between Lake Superior and Lake
Huron Today (Feb 14, 1998).

    Water Temperature was a balmy 32 degrees Fahrenheit (0 degrees Celsius)
+ or - and both of my buddies brand new Scuba Pro Regulators free flowed.
One was a Mk 10 first Stage with a Polar second stage, the other was a Mk 20
first Stage with a G500 second stage, both first stages have the TIS thermal
insulation system. The Polar had about 20 hours on it, the G500 about 10
hours. The G500 free flowed 30 seconds into the dive, the Polar free flowed
5 minutes into the dive.

    We are experienced cold water divers and did not breathe off the regs
until under the water, and kept the tanks and regs as warm as possible until
the time we went into the water. So I know I could rule out the human
factor.

    I was using Poseidon Odin's, a tried and tested reliable cold water reg
(however I find the second stage blows ice chunks into your lungs sometimes
and that the antifreeze kits are the shittiest design ever) and they did not
free flow (actually I have never had them free flow knock on wood)

    In the interest of being truly Hogarthian I am about to purchase two
Scuba Pro Mk 20 first stages with either two G250 or two D400 second stages.

    My question is, is this typical of Scuba Pro regulators to perform
poorly in cold water. My friend has seen many Scuba Pro regulators free flow
on his charter boat in Whitefish Bay Lake Superior, but I do not think that
they had this new TIS thermal insulation system on them. Does anyone else
out there have any experience with any Scuba Pro reg in water of this
temperature (32 degrees Fahrenheit 0 degrees Celsius)?

    Would an antifreeze kit reduce the performance of the first stage and
would it help with the cold water? It is to my understanding that when the
ports to the ambient chamber are covered by an antifreeze kit that the
performance is reduced. If this is true how much?

    I know a piston reg will deliver more air than a diaphragm regulator on
any day, but that does me no good if the regulator is going to free flow at
the sight of snow.

     I really like the design of the G250 and D400 and am seriously
considering purchasing two of them, however I want to make sure that these
regs are not going to blow off every time I get into cold water, which
around here is 9 months of the year (12 months if you go past 100 feet).

    Can anyone out there give me any suggestions, anyone have any experience
with these regs in water this cold? I know they are good regs, I just want
them to be good cold water regulators as well. Any Scuba Pro technicians out
there with cold water experience?

Thanks for your time

Richard Hayward





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ORG:HD Diving Services;Contracting
TITLE:Owner/Operator
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TEL;HOME;VOICE:(705) 949-3431
TEL;CELL;VOICE:(705) 946-9380
TEL;WORK;FAX:(705) 949-1580
TEL;HOME;FAX:(705) 949-1580
ADR;WORK:;Services;23 Montgomery Avenue B;Sault Ste. Marie;Ontario;P6B =
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Avenue=3D0D=3D0ASault Ste. Marie, Ontario P6B 1M4=3D0D=3D0ACanada
EMAIL;PREF;INTERNET:hddiver@ic*.ne*
EMAIL;INTERNET:hdnitrox@ho*.co*
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