attwood Primer Bulb Assembly Hose (5/16-Inch) Attwood primer bulbs for easy replacement on any portable fuel line. Made to the highest quality standards. Alcohol resistant, suitable for use with leaded and non-leaded fuels. Primer bulb is injection molded for strength and durability. Double check valve for quick priming and unrestricted flow. Non-corrosive, galvanized hose clamps. Attwood primer bulbs meet SAE J1527 ASTM fuel C class II standards and ABYC portable fuel system requirements.