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Originally Posted by Shaneerph
Endurance 3316g with full kitchen gray tank. All valves open and still not draining. Had one month, only water in sink, no food... any ideas on how to get gray water kitchen tank to drain? Two black pipes under trailer one definitely drains black tank and a gray tank, but not sure what the function of the other pipe. Most of what I have found say only one gray tank, but monitor suggest kitchen gray is full as well as sink back up.
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Looks like you have a second discharge pipe next to the one your are connected to in that pic. Like the other response says, follow that pipe back towards the tank and there will likely be another pull valve.
I had a similar experience as the guy that did my delivery never pointed it out and it is in a different location than my black and front gray tank. My second gray tank valve is way in the back behind my axles even though it feeds into the same discharge outlet as the other two. Mine was actually open so the first time I camped and removed the cap I was showered with gray sink water (fortunately not black!).