Meanjean73
Well-known member
Can anyone explain why the plumbing for the flush system is routed under the bathroom sink? I get they need a vacuum breaker device but why so much plumbing? Couldn’t it be routed inside the wet bay?
Black Tank Flush Plumbing
- Thread starter Meanjean73
- Start date
Meanjean73
Well-known member
The value of this forum is amazing!
Creek Jenkins
Well-known member
My black tank flush line vacuum breaker / backflow preventer / general nuisance thingy started buzzing vibrating shaking and generally misbehaving today. Also leaking at the fittings which were by golly only finger tight. Evidence of water from previous leakage, what the helms. Very disappointing quality control again.
Anyway I assume by the noisy tantrum it is FUBAR and I’ll have to replace it. Has anyone tried a better option than the cheap POS plastic one?
Cheers
Creek the Wonder Dog
Anyway I assume by the noisy tantrum it is FUBAR and I’ll have to replace it. Has anyone tried a better option than the cheap POS plastic one?
Cheers
Creek the Wonder Dog
Creek Jenkins
Well-known member
Never mind, I found a brass version on Amazon for $30. I’m going to give it a smash and see how it goes. I think the extremely hard water in Texas is probably the cause. However the loose fittings are probably the cause of my elusive leak I have been chasing since camper was new. Water runs down the line to the nautilus but also along bedroom wall under slide and drips into basement. Only leaks when back flushing black tank - I never made that connection.
Link? Once you confirm this works, I will do the same. I hate plastic stuff.
Retired UPS Man
New member
Well
The vacuum breaker needs to be at least 12" or so above the flood level of the device its protecting. In this case the top of tank.
It also needs to be in a out of the way protected location. and close to the water source.
The bathroom sink allows it to be high enough above the tank in a protected heated location.
under the sink is not ideal for access and other reasons but I understand why the designers choose that location
George
Prominent Member
Actually 🤓... The vacuum breaker is typically mounted at least 6 inches above the highest point of any item connected to the waste tank, In this case the throne.
I think we are saying the same thing. However Is the vacuum breaker protecting the tank or the toilet? Where will the backflow contamination occur?
Yes its protecting the fresh water lines going to the tank. Although I think George and I are making the same point. The distance is referenced by the tank vs. the toilet.
Chaseweston
Well-known member
You could always just replace with a brass check valve and be done with it. I replaced both of our VB's with like for like plastic ones and if (when) they go again, I'll be swapping in brass check valves. Orientation doesn't matter, water pressure doesn't matter to fully open and not leak, etc.