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Old 09-11-2012, 02:14 PM   #1
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Question 21WP Fresh Water Tank Drain/Overflow Lines?

We filled our fresh water tank for the first time and as we were filling water was emptying out of two hose lines coming out from under the trailer (not the two low point drains with valves) near the back left rear axle. The belly is covered, so I can't see where these two lines connect. My first thought is that they were fresh water tank overflow or vent since neither had valves, but water was coming out before the tank was filled. If one of these lines is a drain, I can't find a valve for it anywhere, nor can I find any other valve that could be a drain valve. Any help on identifying these lines would be greatly appreciated.
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Old 09-11-2012, 02:31 PM   #2
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What year is your 21 wp ?

Might help with getting your answer.
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Old 09-11-2012, 02:35 PM   #3
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Oops, sorry. It's a 2012.
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Old 09-11-2012, 02:37 PM   #4
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Well your ta nk defiantly has a drain and an over flow.

Shut off for tank drain has to be some where .......

Is it possible it was only coming out of one line ?

Btw welcome to the forum !
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Old 09-11-2012, 02:43 PM   #5
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Thanks. Possible that one is the drain and one the overflow, I would have to check again to see how much was coming out of each or if it was possibly just one. I know that when it was near full, water was definitely coming out of both. If that is the case, I still have no idea where the drain valve could be. I've looked everywhere inside and out that I can think of.
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Old 07-14-2013, 09:40 PM   #6
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For all 25rr and campers owner that gave a overflow
Hose coming out the bottom of your fresh water tank I just cut back belly plastic to see were the breather connects to tank..
Ran hose up through floor following the fill line and connected it to the spot were there is the screen vent is. Now when I fill up tank vents through vent hole like its supposed to be way better than the way the factory installed.
Sam2581
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