I keep a compressor onboard and have the fitting so I connect the air line to the city water line. Also the fitting has a very small hole. I drilled it out a little bit for more air flow but still keep it under 50psi. I think I use 40psi. I don't use antifreeze at all. I only blow out the lines. I do pour antifreeze in the drains. Also Make sure to drain the water tank.
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