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So it appears that other than the Happy D, most rear outlet or rear discharge toilets use some sort of power flush mechanism inside the tank. The Happy D seems to use a gravity feed scheme, which is what I'm after. So, to confirm: with a rear outlet toilet and conventionally attached tank...

rear discharge -- thanks and question Thanks, I'm looking into the Happy D. I can't hang it on the wall, it needs to be a floor mounted (say 4" rough in) unit. For such a rear outlet set up, will i need to have a cistern way high up to generate the required flushing force? I'm not sure if...

I'd like to replace my floor mounted rear outlet toilets (Kohler Barrington two-piece with Flushmate pressure assist top tanks). I cannot change the rear discharge plumbing. I have four toilets to change out. The problem is that the pressure assist systems have all of the quiet charm of a hand...