Installed a Niagra toilet about two months ago. It has a "pan/bucket" in the tank that fills with water about 1/2 gal I would guess. When you turn the handle to flush,the tank/holding pan emties into the tank flushing the bowl. Comes with a "life-time" guarantee that it will never have a run/drip problem that flappers cause. Anybody used or have an opinion on this unit.. So far I have no problems ( of course I realize this is a short amount of time). thinking on using them on other projects just want to make sure they are reliable.