Little Giant Trough-O-Matic Stock Tank Valve with Plastic Housing is specially designed to help control the water level for plastic and metal pans, barrels, troughs, and tanks automatically. It is constructed of high-quality polystyrene plastic housing which guarantees strength and great durability. This all-plastic valve has a flow rate of 245 gal. per hr. and operates between 20 to 50 psi pressure so you can be sure it is very safe to use.  It can be used with a standard 3/4 in. garden hose thread. Product measures 7.5 in. long, 3 in. wide, and 3.5 in. high.