EVM A/S 160-1/4 Anti-Siphon Valve 1/4" MNPT x 1/4" Barb Alum Anti-Siphon Valve | EVM A/S 160-1/4 1/4 in. MNPT x 1/4 in. Hose Barb Aluminum Anti-Siphon Valve 160 Series Designed to prevent the siphoning of marine fuel tanks should a fuel line leak or break occur