Originally Posted by MartyG
Just a guess, but in my (years ago) limited experience with pop-ups, the drain for the cold-water sink was a garden hose connection, like the yellow one here. However, in this unusual model, with hot water and a shower, it appears from the pictures they installed a wider drain pipe. (and, I would hope, a larger gray tank.) But I don't see a valve in that line. Does that mean you have no tank, and must hook up to sewer? I'll follow this thread until the OP finds out and tell us all!
My big Coleman Niagara did not have an on board gray tank, everything fed to the garden hose sized drain. The Coleman Niagara had; water heater, shower, cassette potty, sink, microwave, two stoves, air conditioner, two king sized beds and a slide out dinette. It was a real pig to tow, the weight and balance on it was very poorly done. It ran very tongue light and to get the tongue weight up to where it needed to be you had to load up the front storage compartment, then you were close to or over GVW. Then there was the issues with the infamous ABS tops. They had a bad habit of failing, they had a lifetime warranty, but that warranty wasn't worth the paper it was written on.