I combined the gray and black water outlet the other day. It's hard to see in the photo. I'll take a better one tonight. I bought a t-valve setup on eBay. It was about $35. Then bought one 1.5" coupler one 1.5" 45 degree angle and 5' of 1.5" abs pipe. All available at most Lowes. The t-valve has the same bolt pattern as the black water valve for the factory. So I just unbolted the factory valve and bolder this one in its place. ThenI cut the gray water pipe about 3 inches past the bracket holding it up. I assembled an new piece of 1.5" abs to the original pipe with a 45 and ran the pipe into the new t. Not there is only one 3" outlet so I can flush my hose with gray water after the black water is done. The whole mod cost about $60 and was done in less then an hour. I did have to relocate the stabilizing jack forward about 18" but that wasn't a big deal.