[IMPROVED FLUSHING EFFICIENCY]: Enhance the performance of your flushing system using WINONLY's toilet flapper ... such as American Standard, Kohler, TOTO, Mansfield, Gerber, and more.

The third one was also missing the bumpers between the seat and the bowl. Kohler toilet w/ piston water flush 2 step doesn't flush even at the 1st step, let alone at the holding the handle down ...