Anti-Siphon Valve 3/8"NPT x 3/8" HoseMoeller Anti Siphon Valve Anti siphon valves are required by Federal Law and the USCG on all permanent fuel tank installation. Use 15 (Brass) calibrated for HP 200 & above and 30 (Aluminum) calibrated for HP below 200 Delivers Coast Guard industry standard anti siphon protection on all gasoline powered boats
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