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Cold supply is at the bottom of the tank, hot water out is at the top of the tank. If there is only one valve at the cold supply, then yes there should be a check valve on the top fitting. You may have it installed backwards.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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