All-metal valve flows up to 245 gallons per hour and operates at pressure between 20-50 psi. Features durable aluminum housing with nylon orifice. Accepts a standard 3/4" garden hose. 
 
Anti-siphon with Expansion Brackets model complies with basic back-siphoning regulations. Measures 7.5"L x 3"W x 4.2"H; fits tank rims up to 2" thick and 4.325"W. Original and Original with Expansion Brackets models measure 7.5"L x 3"W x 3.5"H.