For mounting around the toilet unit, fits all existing toilet unit brands Par, Raritan, RM, Groco as well as our models 50.207.25, 50.217.25, 50.207.12, 50.205.12, either manual or electric; for a correct installation with manual or electric toilets, it requires a by pass and a draining pump; the pumps ca be removed if the draining is used with a "Waste" plug on the deck.