The Valve Shop distributes a variety of float valves to monitor liquid levels and prevent tank overfilling. Gadren has float valves in brass, bronze and stainless steel in connection sizes between 1/2" and 3". Kerrick PVC plastic float valves are designed for heavy duty projects and are available between 1/4" and 1 1/2". Hayward float valves are designed for extreme conditions, and feature an extra-heavy wall thickness to withstand damage, and are available in sizes from 1/2" to 4".