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Kohler 2-Inch-Flapper, One-Piece Toilets
Kohler Toilets manufactured prior to 2004 are most common with a 2-inch flapper.
Kohler 2-Inch-Flapper, Two-Piece Toilets
Kohler Toilets manufactured prior to 2004 are most common with a 2-inch flapper. All two-piece toilets that have a 2-inch flapper use fill valve GP1138930 .
Kohler 3-Inch-Flapper, One-Piece Toilets
Kohler Toilets that have a 3¼-inch flapper are Class Five® toilets. All Class Five toilets use fill valve GP1083167 .