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Old 12-30-2017, 12:47 PM   #1
1 Rivet Member
2015 27' FB International
Fair Oaks Ranch , Texas
Join Date: Mar 2016
Posts: 14
Low Point Drains After Anti Freeze

Should low-point drains be open or closed after antifreeze is pumped into all lines?
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Old 12-30-2017, 01:33 PM   #2
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1994 34' Excella
Warren , Manitoba
Join Date: Apr 2006
Posts: 937
I quickly open and then close again, after I have confirmed that the pink anti-freeze comes out. This protects the valves in case some water was trapped above the valve. If you leave the valves open, all or most of the anti freeze you put in the lines will drain out. Make sure you "flush" the toilet until anti freeze is seen entering the bowl.
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Old 12-30-2017, 01:33 PM   #3
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2014 20' Flying Cloud
Sag Harbor , New York
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Ditto. If your low point drains were not open when you pumped AF into the lines, there may be water still trapped at those "dead end" supply line locations.

If, however, you opened the LP drains, until AF ran out, and then closed the drains, you should be OK.

These sort of nuances of using AF are why we never use it [for the supply pipes H/C]. Just compressed air to blow out all supply lines, etc..

Happy New Year!

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Old 12-31-2017, 12:29 PM   #4
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Walkerton , Virginia
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Once I see the pink stuff, I close the valves,

Somebody, please, point me to the road.

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Old 12-31-2017, 07:32 PM   #5
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1975 27' Overlander
Conifer , Colorado
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Low point drains are considered just another "faucet". Open them and let the pink RV antifreeze dribble out and then close them up again.

I blew the water out of my 75 Overlander. Every faucet was nothing but air. The low point drains were then opened and a blew air until they were nothing but air.

Then I removed the old copper plumbing lines from the trailer. I was shocked at how much water was still in the lines. It may not have been enough to bust a copper pipe, but I decided the air blow method is just not good enough for me. Low point drains are even less effective in my view.

Pump in RV antifreeze everywhere after the air blow process and you're ready for winter.

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