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.