The Fits TOTO Fill Valve is designed to replace G-Max and Power Gravity Toilets. Designed to fix no/slow refilling, running, and noisy toilets, the fill valve is quieter than other fill valves. The Fits TOTO Fill Valve is very 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 fill valve adjusts from 7-3/4" to 13-1/2". Easy to install.