The Korky Ultra 2X Flapper is the longest lasting, most universal large 3 in. flapper. The proprietary Chlorazone II rubber formulation lasts 2 times longer than other flappers and is backed by a 10-year warranty to hold up in the harshest environments. Korky red rubber resists chlorine, bacteria, city water treatment, hard water, and well water. The flapper adjusts to match original toilet settings. The 3070 flapper fits the following toilets: Standard: activities (4191A), Cadet 3 (4021), Cadet 3 Flo wiser HET (2568, 4019, 4021, 4021N), clean (4000)edge merer (4159A), Titan elite (4117A)aqua source: blue flapper (98923), white flapper (98923) and 810485. Crane: sure flush (31242). Correspondent (RP71179), prelude (RP711Rosario (RP71191), Rios select (RP84502). Eljer: diplomat (4021), Titan (141-0777). Fergus prof aloof HET (PF9400) Gerber: avalanche (28-890), avalanche HE (28-890). Glacier Bay: N2428T, N2428RB, TQRS1NP4P1, 173-239, 331-725T, 1002-109-308/N2442T. Jacenta: era (BK spreeing (ex6), Lyndsay (SW08959 SW08969, SW099maximumimumimality (ex37), perfecter (ex33), prestige (GV80). Kohler: Cimarron (K-4634). Mansfield: Barrett (106), Brent wood (3147) denial (3916), maverick (maverickverick 1.28 (protectorate (1386), summit ADA (386), Waverly 1.28 (3195). Pegasus:colonnade (152-143) Westminster (164-146). Project source. TOTO: drake (ST eco), eco drake (743E), supreme (MS863113, MS864ultimateness853113, MS854114). Tuscany: Erie (Z58R16S19306), Huron (Z59E16S19306).