Go to one of your rv supply stores and get a winterizing kit, simple to put in. It goes in the line from fresh tank to the pump usually just at the pump. then you just turn the valve and pump from the pink jug into and thru the pump.
I just got my used 05 3400rl so this is the 1st time winterizing it and I had a few questions. It's not a big deal once you know what to do and can be done quicker than it takes to vacume the floor.
I blow mine and then pump the pink just incase there are low spots
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