Moeller Marine 033801-10 Aluminum Anti-Siphon Barb Anti-siphon valves, are required by Federal Law and the USCG on all permanent fuel tank installations. 30 Calibration for HP below 200 HP. Yields 30 vertical height protection. Deliver Coat Guardindustry standard anti-siphon protection on all gasoline-powered boats. Combines anti-siphon protection with a convenient hose barb design. MOE-033801-10 Features 38 Barb 14 NPT Threadding Aluminum 30 Calibration Calibrated for HP below 200 California Re