PlumbCraft Adjustable Anti-Siphon Ballcock - Fits Most Toilets Eliminates toilet noises & running water Anti-Siphon technology provides water supply protection keeping your drinking water safe. Adjustable height 9-1/2 inches to 13-1/2 inches provides universal fit for most toilets Easy to install. Toilet repair kit includes easy detailed instructions. Contains one anti-siphon ballcock assembly and one refill tube with clip