The Shoreline Marine Universal Fuel Primer Bulb is durable, reliable, and made from tough, weather-resistant rubber. It comes equipped with spring-loaded double-check valves and stainless steel hose clamps and features Speed Prime technology for easy fueling. This Universal Primer Bulb is designed to fit both 5/16' and 3/8' fuel lines and is suitable for use in all weather conditions while also meeting EPA requirements.Stainless steel hose clampsAlcohol resistantDouble check valvesExtreme climate-tested rubberSpeed Prime technologyFits both 5/16 in. and 3/8 in. fuel linesEPA compliantQuantity per pack: 1