Little Giant Trough-O-Matic Stock Tank Float Valve with Plastic Housing and Expansion Brackets Automatic stock tank float valve supplies water to stock tanks troughs and barrels. Flows up to 245 gallons per hour, operates between 20 and 50 psi High-grade polystyrene housing with expansion brackets to fit tanks with wider or thicker rims Accepts a standard 3/4 inch garden hose Also available in aluminum housing (Item No. TM830T, sold separately)