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Old 05-03-2013, 09:02 PM   #1
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How to stop waste water from leaking out when removing cap?

I've only been out a few times in my new trailer, but I can't figure out how I can stop the small amount of waste water that comes out when I remove the cap.

Perhaps the back water valve doesn't seal well and it's water that accumulates between the valve and cap over time, but its about 2 cups worth.

Not awesome. Does this happen to others, is it it most likely a bad seal?

If it does happen to others, any tips on preventing or dealing with it?
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Old 05-03-2013, 09:12 PM   #2
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I guess it probably shouldn't but my old rig does the same thing. I have room in my wet bay to keep a little bucket under the cap. Not a big problem to rinse the bucket after I'm done dumping but always a bit of a surprise if I forget that it is going to happen when I take the cap off.
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Old 05-03-2013, 09:15 PM   #3
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Sounds like a leak with that amount coming out. To see if it's residual or a leak, leave the cap off and a cup of some type under it for a day or so. if it continues to drip after a few hours, you know a seal is leaking. Replacing a valve or the seals is not difficult. Four bolts, a seal kit and a bit of grease or Vaseline and the job is done. Can be a bit messy, but you can either tip the rig away from the drain with the jacks or a hydraulic jack under an axle after you drain the tank.
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Old 05-03-2013, 09:49 PM   #4
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Ya, it's probley a seal leaking. My old rig does the same thing. I should fix it but, I just catch it like Quaddiman40 says. But, I'm only losing a few ounces. If your up to losing a couple of cups it's time to get it fixed.
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Old 05-03-2013, 10:09 PM   #5
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I added another valve that i bought at Camping World. I just installed it in the same place my sewer hose attaches. Now my sewer hose attaches to it. Works great no leaks to date. You just open it after you hook up your hose and before you dump.
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Old 05-03-2013, 10:25 PM   #6
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Sometimes it appears that something gets in the way of the valve closing completely. Dump a couple of times and it might disappear. If you are dumping in a place where even a small amount of spill is a problem be prepared with a cut off gallon water bottle. If it is a continuing problem then it may require maintenance.
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Old 05-03-2013, 11:21 PM   #7
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I had the same problem with my Discovery. Played with it for a couple years, and finally, just had enough, so, I bought a new valve at CW. When I got the old one out, I was glad I had bought a new valve, because the problem was a shard of the tank, (when it was tapped) was caught, and had over time ruined the valve. What a relief to pull the cap, and not get a cap full of liquid.
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Old 05-04-2013, 12:45 AM   #8
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I replaced my cap with one that has a capped garden hose thread adapter. This allows me to dump my grey through a hose into my tote, but also a way to avoid sludging my shoes if it springs a leak, and also allows me to break the pressure seal if I go from high altitude to sea level.
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Old 05-06-2013, 08:40 AM   #9
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I would guess seal too...

but, are you leaving the valves closed until it is pretty full THEN dumping - otherwise there might not be enough flow to 'evacuate' everything paste the seal...

good luck and not something I want dumping on me
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