Moeller Brass Anti-Siphon Barb 1/4" NPT x 3/8" BarbThis must-have Moeller valve meets ABYC H-24 requirements and provides anti-siphon protection. The Moeller Brass Anti-Siphon Valve delivers Coast Guard/industry standard anti-siphon protection on all gasoline-powered boats. Combines anti-siphon protection with a convenient hose barb design. Coast Guard/Industry Standard protection; Calibrated for 200 HP and above; Accommodates up to 3/8" barb; Brass;