2008 Seneca MS36 holding tanks

[76crewcab]

Newly purchased a 2008 Seneca MS36 and can't get the kitchen and bathroom sink to drain. Are there more than 1 grey water tanks on this unit? If so where would the valve be? I have 2 black and only 1 grey that I see valves. I have contacted Jayco but not much help. Any info would be greatly appreciated!!

[WinnieView]

There could be valve handles in the wet bay cabinet and the one just aft.

[Rick-in-Houston]

My 2017 Jayco Seneca 37RB has one in the wet bay and one in the electrical bay and yes you have to grey tanks most likely.

[JoeyNick]

Originally Posted by 76crewcab

Newly purchased a 2008 Seneca MS36 and can't get the kitchen and bathroom sink to drain. Are there more than 1 grey water tanks on this unit? If so where would the valve be? I have 2 black and only 1 grey that I see valves. I have contacted Jayco but not much help. Any info would be greatly appreciated!!

There is a hidden gray water valve behind the white panel in the outside "wet bay". It's just to the left of the black pipe and it's not visible unless you get your head under the panel. You can feel it when you stick your hand under the panel and reach up just a little.