The fits TOTO fill valve is designed to replace G-Max and Power Gravity Toilets. Designed to fix no or 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 8 to 14 in.