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I think two things got it.  First, when tank contents is used to dry the 
dust cap, the water can be sprayed into the inlet of the regulator very 
easily.  This is described in Vance Harlow's "SCUBA Regulator Maintenance 
and Repair", I have noticed this one set of mine and changed the way I do 
it, to prevent water from contaminating the inlet.

Second, you my be putting too much trust in cap to keep out water while 
soaking it.  The cap can keep out dust but not provide a seal tight enough 
for water.  Also, pressing the purge can let water flow backward into the 
hose, then it has a straight shot to the 1st stage.  For soaks, I keep the 
1st stage on a tank and pressurized.

Good diving,
Mike Ruble

At 23:43 02/18/2000 -0800, you wrote:
>Hi,
>
>     I recently took my backup reg in to be serviced - a Scubapro Mk 10
>and G250, and was later told it wasn't worth servicing - it was too
>corroded inside the first stage and the 2nd.  I bought it 2nd hand
>(never do that again!) a year and 1/2 ago, had it serviced then and put
>about 150 dives on it in a cold saltwater environment - Canada, west
>coast.   I always hosed it off and soaked it in cold freshwater after
>every dive until the next one a few days later.   Has anyone seen this
>before - is keeping the reg constantly wet at fault or does this happen
>with age?   Local shop technician said this is why diaphram regs are
>better in our waters.
>
>
>Thanks,
>
>
>Steve.
>
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