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Old 05-30-2006, 10:17 AM   #1
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pamelake's Avatar
1974 25' Tradewind
Lake Oswego , Oregon
Join Date: Jul 2004
Posts: 218
Dump Valve Leak! Ideas?

My '74 Tradewind has a constant drip from the dump valve. Has this been a problem for anyone? Is there any maintenance I should be doing that might help? Should I just take it in for repair? Thanks, Pam
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Old 05-30-2006, 12:30 PM   #2
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2016 25' Flying Cloud
Sunnyvale , California
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It depends...


Besides loving that answer (law school training...) you might be able to fix problem yourself, or it might take dealer.. Common causs of leaks are something getting "stuck" in edges of valve, which slides to close. If something (like TP or worse) gets stuck in groove, valve slider won't close all the way. If you want to try, AND you have place to work on it without making major sanitary mess, you could try combination of back flush with hose towards open valve, while moving it back and forth (with helper) and also use lubricant from RV supply place to assure it closes all the way. Long handled wire brush or other "tool" to dislodge anything stuck in valve body might help, but remember that all it touches is plastic...

If that fails, then valve may have cracked or a plastic piece may have broken, and a replacement would be required. You might be able to do that also (degree in rocket science not required..) but it is hard to work on and messy also..

John McG

In Theory, there's no difference between Theory and Practice, but in Practice, there is usually a difference...
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Old 05-30-2006, 01:42 PM   #3
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1974 25' Tradewind
Lake Oswego , Oregon
Join Date: Jul 2004
Posts: 218
Thanks John!

Sounds like this is not a job for the faint of heart (or better 'weak of stomach')...thanks for the pointers. I pulled some pictures from a previous thread, so now I will find my protective gear and go to work. Thanks for your help again.... Pam
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Old 05-30-2006, 07:06 PM   #4
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2001 34' Limited S/O
Moyock , North Carolina
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Since it is just leaking and not stuck, flush it good and then try to dislodge any foreign material that my be lodged. Some of the units have the valves quite accessible, mine is not. I would not hesitate to remove the valve if it can be reached. The rv repair places really make you jump through hoops to ensure that the tanks are empty and clean.
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Old 05-30-2006, 07:37 PM   #5
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1977 23' Safari
Hillsboro , Oregon
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Both the black and grey leaked on my previous trailer. Nothing beats wading into a valve rebuild project for the first time.

It could be that all you have to do is replace the gaskets inside the valve if these other suggestions dont do the trick.
2009 F-350 FX4 Crewcab 4x4 6.4l
former '78 Argosy 20' Minuet owner
former '77 23' Safari owner
former 25' Fun Finder X-250BHS SOB owner
current 26' Komfort Trailblazer 262BSLE SOB owner
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Old 05-30-2006, 08:01 PM   #6
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1982 34' Limited
1975 31' Sovereign
Grovetown , Georgia
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After pulling the cap off twice and gettting a puddle of honey water I took the belly pan off around the valves and looked. I have Thedferd valves and cannot be taken easyly and they were over 25 yrs. old. I decided to replace. For what the two Thedford valves would have cost I got 2 Valtera valves a new Y, piping and glue. The VAltera valves are easy to replace the O rings and knife gate by taking out 4 screws. It took a full day to do this. I took my time did it right this includes cleaning the tank throughly and litting dry. The pipe need to be ABS and the glue does too.
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