I think Prevo kinda decides by the size of the bay, the converter puts as BIG a set as can fit. Ours measured out to be 120 or 125 Gal. We dont have a seperate gray tank, first motorhome we had without. Accept for flushing the hose after dumping, it really hasent affected much.

We also do not have a gray water by-pass. I am curious as to the correct use of this option. This is convienent if boon-docking but in a campground with sewer hook-up, and an electric dump switch I cant see a huge advantage? Am I overlooking something?