thanks Old biscuit- I will use that diagram. I plan on buying blue and red pex and then use the white click lock connectors I've seen at the rv store. shark bite is basically the same but their fittings are expensive. I'll have to buy several 90 degree, tee, and straight fittings. then the next obstacle is installing a black tank under the rv. Already has a grey and fresh there but no black and the PO had installed an aftermarket wet bath which was correctly plumbed to grey tank for the shower part but then left a pipe under the toilet with no tank or hookup. Bad thing about class C's is the limited space under rv due to other things like genny, propane, driveshaft, and genny exhaust. Unfortunately for me the space directly under toilet is very small, may have to use a very small holding tank unless some sort of way to put black tank at back of rv next to fuel tank and use a macerator. That's a challenge for another day
