Seachoice Anti-Siphon Valve, 1/4 in. NPT, 3/8 in. Hose, Aluminum, Meets USCG …
One-way anti siphon valve prevents fuel theft and fuel spillage Made of corrosion resistant aluminum Meets U.S. Coast Guard regulations Thread: 1/4 inch NPT Hose: 3/8 inch inside diameter Manufacturer part number 50-20991