Common for water heater to have just one valve.
Valve handle aligned with line that connects cold and hot is 'bypass'
Check valve used in HOT out to stop backflow when using 'bypass'
Valve handle aligned with cold water supply then water will flow into water heater tank
Remove water heater drain plug and make sure is empty
With water hose hooked up to 'city water' connection turn supply on
Then open each faucet hot side and cold side until antifreeze is blown out
Then do shower hot/cold, toilet and finally the hot/cold low point drains.
After clearing lines of anti-freeze you can then turn the water heater 'valve' 1/4 turn
It will then change from 'bypass' flow to cold water inlet flow
Water should blow out of water heater drain hole.
Turn off water supply...install drain plug
(Suburban uses a 3/4" ---anode rod. Use new if current is 75% gone.)
(Atwood uses a 1/2" NYLON drain plug --no anode rod---use new if current plug threads are messed up)
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Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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