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Old 11-07-2010
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Bill Pape Bill Pape is offline
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Join Date: Jan 2008
Location: Commerce
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Sounds like that pesky air purge valve used for Winterization.
toggle the air purge switch several times , could be on the side of the bed, or near the fresh water tank drain.
ALso behind the shower know trim plate there may be a balancing spool used for a non-scalding control, That is if you have a Moen shower faucet.
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