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In a message dated 7/29/00 7:38:40 AM Central Daylight Time, gzambeck1@me*.ne* writes: << On the MK14 regulator, what is the interstage pressure and the second stage cracking pressure that you set the regulator for both recreational and technical diving? >> The factory spec for the intermediate pressure of all Scubapro first stages is 125 to 145 psi above ambient. Usually, out of the box, the factory setting will be about 140 to 145psi. They are set to the high end of the range for better airflow for the recreational diver. I adjust the i.p. down to near 125psi for cold water. Even with the older style MK10, MK15 and MK20 if the i.p. is set low like this there is little likelyhood of icing, unless you are a real Hoover or you do something stupid like using your second stage to directly fill a lift bag. The new model of the MK20 has a composite piston and an insulating sleeve with sharp ridges to break away ice. I think that it should be a pretty good cold water regulator as long as the i.p. is reset low. The MK14 is nearly impervious to freeze-up. I usually set Scubapro balanced second stages, such as the G250, G500 and S600 for a breaking pressure of between 1" to 1.4" H2O -- more to the high side for cold water. The D400 does not need to be readjusted for cold water. Safe diving, Dale -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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