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· ancient mariner
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my water heater has a bronze swing check valve. when winterizing the system i disconnect the inlet & outlet hoses. i put a screwdriver in the inlet to hold the check open till all the water drains out , then connect the two hoses with a copper pipe. i can then pump antifreeze through the system and not put any in the water heater. you don't use as much antifreeze & do not have to flush the water heater when you flush out the antifreeze in the spring
 
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