1/4" MNPT x 3/8" Barb Brass Anti-Siphon Valve | EVM A/S 160-B EVM A/S 160-B Anti-Siphon Valve 1/4 in. MNPT x 3/8 in. Hose Barb Brass Anti-Siphon Valve 160 Series Designed to prevent the siphoning of marine fuel tanks should a fuel line leak or break occur Replaces OMC 173274