[EXTENSIVE COMPATIBILITY]: Carefully crafted to be a replacement for flappers in commonly used 2-inch flush valve toilets, 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 ...