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Not exactly sure what you are asking...
The hot water tank has by-pass valves to eliminate it, or should, then pull out the drain plug to drain it and not put anti-freeze in the tank.
On our rig, there is a by-pass valve from the FW tank to the FW pump (FW=fresh water), you then open valve from FW pump suction tube with it submerged in the anti-freeze bottle and close valve from holding tank.
Opening different water spigots, with pump on to get anti-freeze in the lines hot or cold, is this what you are asking?
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Rusty
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