3/8 Barb x 1/4 NPT Brass Anti-siphon Valve – Rigging Shoppe

Island Water World, Tee Fittings, Brass Fittings

3/8 barb anti-siphon valve - Moeller Marine

Apollo 1/2 in. Threaded/Solder x 3/4 in. MHT Chrome Plated Brass Telescoping Anti-Siphon Frost Free Sillcock FPHMS12 - The Home Depot

Fuel Fittings

RN FORGED BRASS NOZZLE VALVE, NICKEL PLATED 1 pieces Set ART

Seachoice Anti-Siphon Valve, 1/4 in. NPT, 3/8 in. Hose, Aluminum, Meets USCG Regulations : Boating Equipment : Sports & Outdoors

Moeller Marine Aluminum Anti-Siphon Barb (1/4 NPT) : Boat Fuel Tanks : Sports & Outdoors

Seachoice 20991 Aluminum Anti-Siphon Valve 1/4 NPT Thread, 3/8' Id Hose Barb

Brass Anti-Siphon Marine Valve - Male NPT x Female NPT