The Korky 2X long life toilet fill valve is the longest lasting, most universal fill valve available. The proprietary Chlorazone II rubber formulation lasts 2 times longer than other fill valves and is backed by a 10 year warranty to hold up in the harshest environments. Designed to fix no fill, slow refilling, running, and noisy toilets, the Korky 2X toilet fill valve is quieter than other fill valves and is ideal for toilets since 1994 (1.6 GPF or less). It is fully adjustable to prevent water waste in all toilets. The refill adjuster delivers the right amount of water to the bowl to maintain original performance. This toilet fill valve is easy to install and adjust; no tools are required. Simply remove your old fill valve or ballcock, insert your new Korky fill valve, adjust and you’re done. The innovative twist-lock adjustment makes installation easy. Designed to fit more toilets, the Korky toilet fill valve adjusts to fit both large and compact toilet tanks and fits Kohler, TOTO, American Standard and all other brands. Easy to install, the 528X includes: (1) 528X fill valve, (1) refill tube, (1) metal refill tube clip, (1) mounting nut, (1) tamper proof key, (1) refill adjuster, and (1) Instructions.