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Old 10-01-2012, 09:45 PM   #1
Join Date: Apr 2011
Posts: 74
Black water tank flush line

It appears I have sprung a leak in the black waste tank flush line in my 06 Adventurer 37J. When using it under pressure, as designed, I get water unto the floor. This just happened on the last trip out. Previously it has worked well, so I suspect a bad connection just opened up.

Has anyone had to repair one of these? Do you have to drop the tank, or is it accessible from the top?

On my previous MH, the manufacturer had installed an anti-siphon valve that burst open. It was accessible from the service bay but I can't see the line in this coach.

Thanks for the help.

'06 Adventurer. Number 12 motorhome over 51 years of RV'ing.
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Old 10-01-2012, 11:09 PM   #2
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Probably got a valve in this unit too , seems to be industry standard. mine was hidden behind a bathroom drawer. Found it when a drawer rail support let go.

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Old 10-02-2012, 03:40 AM   #3
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I think your black tank vacuum breaker is defective. I'm not familiar as to where it is on your RV. Hopefully someone else will be. In the meantime , google it and you'll see others with the symptoms you described.


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Old 10-02-2012, 04:05 AM   #4
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Most likely immediately above the flushing water inlet, perhaps just above floor level.
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Old 10-02-2012, 09:17 AM   #5
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The cause is the combination check valve/vacuum breaker. I had the same issue and corrected it by bypassing the factory valve and installing one purchased at the hardware store. I did a write up on how I bypassed the factory valve but I am technilogicaly inept and could not figure how to import it to this reply. If you do a search under MDPD you will find it. Very easy fix and you don't have to take walls apart to replace the valve. Good luck.
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Old 10-02-2012, 01:11 PM   #6
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look here:
Plumbing Diagrams

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tank, water

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