The fits Kohler class five 3 in flapper toilet Tank flapper is designed to fit Kohler parts: 1016546 and 1042313. The exclusive longest lasting red rubber resists chlorine, bacteria, city water treatment, hard water and well water. This is a large 3-1/4 in replacement toilet flapper designed to fit rectangular, black flush valves. Made of flexible rubber for a tight seal and easy to install.
Oatey 42255 Closet Flange, 4 in Connection, Iron, Red
FLUIDMASTER 501P21 Flapper Tank Ball, Rubber, Red, For: Toilet with 2 in Plastic or Metal Flush Valves
Korky QuietFILL Series 528 Fill Valve, Plastic Body, Anti-Siphon: Yes
Korky 818Z Fill Valve and Flapper Kit, Rubber Body, Black/Red, Anti-Siphon: Yes