If you are just going air the bypass is of no concern.
It is there to prevent antifreeze from getting it the water heater.
The air will not hurt the tank, just pull the plug or anode rod drain and let the air push what it can out.
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2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping
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