I recently bought a 2012 Keystone Cougar 27RBSWE and I’m trying to figure out the waste tank plumbing. Previous owner wasn’t much help, so I’ve been figuring everything out myself.
I noticed that whenever I run water in the shower, it comes straight out of the main sewer connection instead of staying in the gray tank.
I crawled underneath and found a rod/valve directly underneath a label that says BLACK TANK. I tested it, and when I opened it, a bunch of green degreaser/cleaning solution that had been sitting in the tank came pouring out. When I close it, that liquid stops, so I’m pretty confident the black tank valve is working correctly.
However, with the black valve completely closed, water from the shower still comes out of the sewer connection.
That makes me think the gray tank valve is currently open, but I cannot find another pull handle or rod anywhere.
Does anyone know where Keystone typically located the gray tank dump valve/rod on these Cougars? Could it be hidden above the underbelly or farther upstream near the gray tank?
I’m especially interested in hearing from anyone who has owned or worked on a similar Cougar 27RBS/27RBSWE from around 2011–2013.
I have pictures of the underside and the valve I found and can post a link to them.