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The Adjustable Large 3 inch Flush Valve and Tank to Bowl Gasket Kit fits specific toilet models made after 1997. Quick and easy to install, the flush valve height easily adjusts from 7 inch to 11-1/2 inch, with no tools or hack sawing required. The oversized tube and funnel reduce flood risk while the included premium flapper and tank to bowl gasket ensure a tight, leak-proof fit. The kit fits most 3 inch 2-piece toilet tanks, but does not fit any Kohler toilet.Fits Large 3 & 4 flush valve openings,Flapper made of chlorine resistant rubber,Oversized tube and funnel reduce flood risk