[RGordon]

First of all, the unistrut can be purchased at any electrical supply along with the clamp. I just trimed one end so that it would lay sideways and used 1/4" zip screws into the frame, then zip screwed the second piece to the frame mounted piece pointing it downward, then secured with conduit clamp. Two short pieces was the right spacing between frame and 3 inch pipe. The 3 inch black piping is just standard schedule 40 pvc and purchased fittings at our rv dealer. The 3 inch manual valve could be mounted in any position, but just placed it in that position for easy access. It really don't matter if the grey or black water valves hold because the manual will take care of it. I really got tired of sudden surprises.