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Old 10-24-2020, 02:24 PM   #1
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Fresh H20 leaking when backwashing

For the 5 years I have been on the road when I backwash my black tank I hook up the outside shower to the backwash,

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Last week when I turned the water on it leaked out where these lines went up in the ceiling of my basement:

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I shut the water off, cleaned up the mess, then turned the water back on. No leaks the rest of the time I cleaned the black water tank.

Next time I cleaned the tank, the same thing happened. I put a camera up the whole where the leak came from:

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Could not see any disconnected hoses, or where the water was coming from:

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Any suggestions?
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Old 10-24-2020, 03:31 PM   #2
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Look for the vacuum breaker / back flow preventer. It can be located under the vanity sink or in the wall accessible through a panel on the shower surround. Sometimes they stick open letting water leak. They are always at least 6 inches above the toilet rim.


There has been several posts on this subject in the past, 2 or 3 within the last week.
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Old 10-24-2020, 04:59 PM   #3
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Quote:
Originally Posted by Scrapper View Post
Look for the vacuum breaker / back flow preventer. It can be located under the vanity sink or in the wall accessible through a panel on the shower surround. Sometimes they stick open letting water leak. They are always at least 6 inches above the toilet rim.


There has been several posts on this subject in the past, 2 or 3 within the last week.
Found it. Next time I dump, I will check there for leaks. Access is behind my shower through a hole just big enough to get my hand. Don't know how I am going to be able to replace it without ripping wall.

Thank you.
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Old 10-24-2020, 08:35 PM   #4
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The black tank flush vacuum breaker has been a leak source for several years on the Montana (SOB) line as well. As many owners just remove them and install a union (Shark fitting) at that point as replace the vac breaker ... just food for thought. Unless your black tank was 100% full and you removed the flush hose for some odd reason at that point ... the lack of a breaker would never be of issue.
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Old 10-24-2020, 08:44 PM   #5
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Quote:
Originally Posted by Scheinin View Post
Found it. Next time I dump, I will check there for leaks. Access is behind my shower through a hole just big enough to get my hand. Don't know how I am going to be able to replace it without ripping wall.

Thank you.
How big is the access hole. Mine is on a closet wall adjoining the shower. It is a fairly tight fit but replacing the valve is not that difficult.

Once the plumbing police chime in you’ll have more info than you ever needed.
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