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The 400A fill valve revolutionized the toilet repair industry with pioneering innovation that works with, rather than against, water pressure. Easy to install & adjustable to fit most tanks & comes with a 1-year warranty. The 400A is engineered to last, and has all of the features you want, which has helped make it the #1 selling fill valve in the world. Anti-siphon design prÐÔÊÀ½ç´«Ã½ contamination of the household drinking water. Water lever adjusting screw for best flush. Shank adjusts valve height from 9" to 14" to fit most tanks. Torque Guard locknut prÐÔÊÀ½ç´«Ã½ thread damage from overtightening the nut.