Description The Clay & Bailey 405 Anti-Siphon Valve is designed to assist in preventing the release of product from an AST should a break or leak occur in the fuel supply line. The 405 Anti-Siphon Valve is normally closed. When the pump is activated, the factory adjusted spring opens and allows fueling. Thermal expansion is accommodated by an internal pressure relief valve. Material Of Construction Ductile Iron, Brass, Stainless Steel and Buna N. Springs are color coded for quick identification of opening pressure.
