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Old 10-22-2011, 07:03 AM   #1
jvee1985
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Winterizing

I was wondering if I need to get antifreeze into my black tank flush pipe or does this somehow tie into the rest of the piping for winterizing I have a 3750FL Keystone Montana.
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Old 10-22-2011, 07:16 AM   #2
SteveC7010
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Originally Posted by jvee1985 View Post
I was wondering if I need to get antifreeze into my black tank flush pipe or does this somehow tie into the rest of the piping for winterizing I have a 3750FL Keystone Montana.
Drain all of your holding tanks as much as you can before you pump any RV antifreeze into the plumbing.

At each sink and the shower, run enough antifreeze to replace all the water in the drain traps plus a bit more to get into the gray tanks and to the dump valves. The antifreeze will protect and lube the dump valves.

For the black tank, run plenty of antifreeze through the toilet. The tiny valves in the toilet's flush mechanism are particularly susceptible to freeze damage by expanding water. This will also put enough antifreeze into the black tank to similarly care for the dump valve.

It is not necessary to get enough antifreeze into the tanks to cover the dump valves.

The piping between the dump valves and the drain hose connection should be dry so there is no need to get antifreeze into that section.
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Old 10-22-2011, 07:52 AM   #3
jvee1985
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Thank you I wasn't sure about the pipe going to the black tank flush but I got everything else done.
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Old 10-22-2011, 08:14 AM   #4
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Thank you I wasn't sure about the pipe going to the black tank flush but I got everything else done.
It has been mentioned in several other current winterizing posts, but I will repeat it here:

The piping to the black tank flush system needs to be at least blown out with compressed air. Some also favor pumping pink RV antifreeze into it as well. If you don't have compressed air capability, then pumping antifreeze through it is more than adequate. You are protecting the vacuum breaker in that line.
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Old 10-22-2011, 11:27 AM   #5
hankaye
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Howdy All;

Back in May or June I wrote about the "vacuum breaker" being a piece-o-cra*!

Still think so. I fulltime in mine and am flushing every 7-10 days.

The first time I flushed the valve blew apart (yep, I had a regulator in the system), replaced it with a 'sharkbite' 90 deg. elbow.
As my flush fitting has NO check valve and the tank is 18-24 inches below the fitting when I disconnect the hose the water 'falls' (drains), into the tank.

So, I'm not winterizing, well, maybe I did, by moving South for the Winter....

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