Universal farm tank watering valve converts tanks or barrels into automatic stock waterers. Requires little attention and keeps open tanks filled with freshwater. Adjustable to several heights and easily installed by hanging plated brackets over edge of tank. Brackets for Poly tanks included as well. Designed to operate from gravity flow or pressure up to 70 PSI. Aluminum housed float valve. Precision die cast outer housing. Durable molded float. Two sets of brackets--fits poly tanks and steel tanks. 300 GPH.