DESC: New federal laws are promptingfilling station attendants and harbormasters to call the Coast Guard on boatowners who pollute. Yet even conscientious boaters sometimes splash fuel outtheir vent line. Attwood's vent-line surge protector can help you avoid federalfines of up to $5,000 for small fuel spills. With automatic nozzles it shuts off the fuel flow when your tank is full With non-automatic nozzles it gurgles when it's time to stop pumping Solid polypropylene construction and simple surge-ball design Fits 5/8'' ventilation hose Clamps included