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Old 05-31-2016, 08:31 AM   #21
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Originally Posted by john mcneely View Post
Forester Fred you misunderstood. My intention was not to flush black tank. I mistakenly hooked to wrong inlet. My intent was hooking up fresh water.

Could be the overflow caused the back flow piston to jam in the safe/ off position. The valve is well pictured in this this thread, remove, open and free up.
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Old 05-31-2016, 08:40 AM   #22
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Originally Posted by john mcneely View Post
What is a B&B made valve and where is it?
It's not good practice when talking about RVs to say your _______ is located here or there because it seems no two are necessarily built the same.

That said, I've seen these black tank flush vacuum breaker/anti-reversing valves located in the bathroom sink cabinet and ...
I've heard them located in the wall behind the shower enclosure (that's where mine is).
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black, black tank, black tank flush, tank

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