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Pactrade Marine Rubber Fuel Pump Hand Large Primer Bulb Fuel Hose Boat Marine Car RV. Primer Bulb for 1/2 inch ( 12mm ) Hose. This Black Primer bulb made by rubber. The Dimension for this item is 6'' x 1 3/4''. In addition, providing more output while maintaining fuel flow that exceed all outboard manufacturers’ requirements. Frequently used as a hand pump in boats for fuel supply to the out-board engine. Compatible with Ethanol blended fuels.