The Fluidmaster 400A Universal Toilet Fill Valve is the #1 selling toilet fill valve in the world. A height adjustable toilet replacement part designed to fix leaking, noisy and slow filling toilet valves, in an easy to install model. The anti-siphon design eliminates fresh water supply contamination, is code approved and efficiently uses water. The 400A is a trusted and durable toilet replacement part, consisting of corrosion-resistant materials combined with simple installation. Fluidmaster is the trusted brand for replacement fill valves and all your toilet parts needs. Parts included with 400A purchase are Fill Valve, Shank Washer, Locknut, Refill Tube, Refill Clip and Instructions. Upgrade your toilets fill performance with this proven toilet tank fill valve. The Fluidmaster 400A is a quick and easy replacement toilet fill valve that solves common toilet problems.