Quote:
Originally Posted by JRTJH
My 27RKS has one sewer drain outlet, two gray tanks, one forward of the slide co-located with the black tank and one aft of the slide, for the galley. Keystone ran a 1.5" pipe under the coroplast (valve is above the coroplast) and it T's to the 3" sewer connector which comes out of the coroplast forward of the slide. Both the black tank 3" and gray tank 1.5" drains connect above the coroplast.
The way Keystone has it set up, the galley drain is "freeze protected" by the valve being above the coroplast and there is a very slight drain slope to the 3" sewer connector.
I'd think it's possible for you to "hard plumb" the single gray tank to the "larger 3" drain so all your tanks drain at the same outlet. I can post a couple of photos of how Keystone did mine if it will help clarify the explanation above.
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I would love to see a picture of how it is connected if you have one handy.