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Before our new Monty, I drained all 3 tanks in our SOB and used my compressor to blow out the lines using the adapter shown in another post. The DW monotered each faucet to varify they were dry while I maintained air pressure set at 40 lbs. I left the valves open during the 'winterized season'. I also added the 'pink' to each drain including the black water tank (about 2 gal). This system worked for us 2 winters in a row although the 'freezing' weather in North GA(Helen) is generally no lower than the mid teens.
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