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I have the humming sound as well, not too loud but it's there. I can't find the check valve on my water heater. All I see is a standard brass "bib" that connects the RV plastic water lines to the water heater.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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