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Keeney Flapper Water Saver K836-79$8.99
Product Features:2" Max Saver adjustable flapper allows you to tune your toilet for more flushing power water savings or the perfect balance of both Convenient top adjustment makes fine tuning easyChloramine resistant material carries a 5 year guarantee Chain guard prevents flapper leaks and wasted waterFits plastic flapper style flush valves with a 2" opening.