Attwood Fuel Line Surge Protector For 5/8" Hose" 

Meets ABYC Standards. Helps avoid fuel spills because the surge helps automatic fuel nozzles shut off as the tank fills. Glass-filled polypropylene construction and surge-ball design. Withstands oil, gas, and alcohol-blended fuels. Compact size allows installation inside gunwale in any orientation within 45° of vertical. Includes two hose clamps.