Attwood In-Line Fuel Overflow Protector [1675-6]In Line Fuel Overflow Protector The fuel vent line surge protector helps avoid refueling spills because the surge free line causes automatic fuel nozzles to shut off as the tank fills. With non automatic nozzles, the surge protector causes a gurgling sound to indicate that the tank is full. Incorporates a ball style check valve with internal baffling. Features: Meets ABYC Standard H 24 Install in line with traditional tank vent systems that use