Description 1/2-inch Toilet Fill Valve Replacement with 7-to-14-inch Water Height Adjustment for European Toilets Fill Valve Upgrade for 2 Piece Models or 1 Piece Toilets Toilet Fill Valve Assembly for European 12/inch connections Replacement Fill Valve by NuFlush NuFlush Adjustable Water Height Fill Valve Fill Valves are designed to fill the toilet tank with water from the water supply line after it has been emptied by a flush. This fill valve is a universal fit for 1- and 2-piece toilets that are bottom water fed with a 1/2 pipe connection. The fill valve replaces the ballcock mechanism and is more efficient and easier to install. 1/2-inch Fill Valve Instruction- Video