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Old 10-17-2016, 04:23 PM   #57
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2014 20' Flying Cloud
Long Island , New York
Join Date: Jun 2015
Posts: 7,084
Ditto to recent comments. 40 PSI is plenty, as it does not take much air to blow out the lines if they have already been drained by gravity. We don't use any antifreeze except in the drain traps. Extra care must be taken with the pump, filter, supply line from the water tank, and water heater. The benefit is that the AF chemicals are never an issue.

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Old 10-23-2016, 06:35 PM   #58
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2017 25' Flying Cloud
Oak Park , Illinois
Join Date: Aug 2007
Posts: 239
For starters, I have been winterizing air streams for the past fourteen winters. My process has been blowing out the lines and the following up with RV antifreeze. In my process, I have not ever pumped the antifreeze into the city water inlet or the black tank rinse. This post got me consider this additional step.

I found a "hand siphon pump" at Home Depot for less than $10. With the needed connections, the setup was less than an additional $5. The pump allowed me to pump antifreeze with ease into both inlets. I feel better knowing I have additional antifreeze coverage on these lines and their associated backflip valves.

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