Designed to fix no/slow refilling, running, and noisy toilets, the Korky MaxPERFORMANCE 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, and adjust. The innovative twist-lock adjustment makes installation easy. Designed to fit more toilets, the Korky toilet fill valve adjusts from 7-3/4 inch to 13-1/2 inch and fits Kohler, TOTO, American Standard and all other brands. Easy to install.