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The connection for "winterizing" aka pumping antifreeze thru the unit is 1/2 inch NPT, and is located behind a panel inside the long vertical door on the right, below the sink. There is also a shutoff valve and a male plug there as well. I got a a male fitting with a 1/2 inch tubing connector at our local hardware store. Just remove the plug, screw in the male fitting and tubing, shut off the valve to the fresh water tank, and start pumping.
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