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Old 12-14-2015, 11:56 PM   #1
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Leaving Dump Valves Open

Hi all,

I just was talking to a mechanic friend of mine that owns a RV campground, he seems to know a lot about RV's. We were talking about winterizing the RV and he said it is important to leave the dump valves in there open position when putting the RV away for the winter, as this saves the seals from freezing against another object and causing premature failure of the seal. I'd never heard of this before, but I trusted him and besides I just spent a ton of money replacing all my seals last year and don't want to go through that again. Has anybody had any issues doing this?

Hank
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Old 12-15-2015, 05:33 AM   #2
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I drain all my tanks but that doesn't necessarily mean all the water is out. All it takes is a tablespoon to freeze and have nowhere to expand but to break something. So I always add about a 1/2 gallon of RV anti-freeze to each tank. The anti-freeze helps keep the seals lubricated.
Leaving the value open wouldn't work for me.
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Old 12-15-2015, 05:39 AM   #3
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I always leave my gate valves open when storing with no ill effects to date.
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Old 12-15-2015, 07:54 AM   #4
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Quote:
Originally Posted by GeocamperAS View Post
I drain all my tanks but that doesn't necessarily mean all the water is out. All it takes is a tablespoon to freeze and have nowhere to expand but to break something. So I always add about a 1/2 gallon of RV anti-freeze to each tank. The anti-freeze helps keep the seals lubricated.
Leaving the value open wouldn't work for me.
Likewise for me.....23 years with two trailers, in freezing storage weather, never an issue with this method.
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Old 12-15-2015, 07:57 AM   #5
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I also close valves because I use antifreeze.

If I were only draining the system, not using antifreeze, I would definitely open the valves.
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Old 12-15-2015, 11:30 AM   #6
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antifreeze in the tank and closed valve
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Old 12-15-2015, 12:04 PM   #7
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I put antifreeze in the tanks and leave the valves closed. I don't want critters looking for a place to spend the winter.
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Old 12-15-2015, 02:33 PM   #8
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He is correct in my opinion
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Old 12-15-2015, 02:40 PM   #9
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I put antifreeze in the tanks and leave the valves closed. I don't want critters looking for a place to spend the winter.
That is what I do...
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Old 12-15-2015, 03:14 PM   #10
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Consider a sturdy screen over the open end to keep critters out. Like 1/4 inch mesh galvanized hardware cloth.


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Old 12-15-2015, 07:34 PM   #11
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For 44 years I have drained the tanks and put in potable RV antifreeze and closed the valves leaving enough antifreeze in the tank to cover part or most of the valve. It has worked for me from northern Montana to California to Atlanta. If I leave the vaves open and uncovered except for critter mesh, I'm afraid that the valves would dry out. Just saying this is what has worked for me for 44 years.
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Old 12-15-2015, 08:30 PM   #12
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Keeping the seals wet sounds like the better plan to me.
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Old 12-16-2015, 12:35 PM   #13
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Closed. Antireeze keeps seals lubed. Keep little animals out.
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Old 12-16-2015, 03:38 PM   #14
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Another "closed with antifreeze". I prefer to have the valve lubricated.
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