I took the sink drain and attached 11/2 PVC to the flex pipe that was original and the wall which the water filter is I went straight down through the floor, put a u-trap and using a 1 1/2 PVC T tied the shower plumbing to this and put 1 1/2 inch to 3" fitting attaching it to the 3" Valterra valve. That valve is then connected to a standard bayonet fitting that the sewer hose fitting goes onto. I will try and get some pictures next time I crawl around under the trailer.
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