Primer bulbs packaged to meet the demands of a fleet manager or mobile technician. Primer bulbs live a life of exposure to harmful UV rays and petroleum products that can break down the materials used in their construction. As a result, they are often replaced; for a fleet manager this can be a challenge. Sierra offers a solution to this situation by probiding ten packs of primer bulbs. Each EPA and CARB certified bulb is constructed of Floroelastomer to give a traditional appearance and feel, and features two double check valves to increase output. Compatible with ethanol blended fuels. In a fleet of boats, the odds increase for an unexpected failure, be ready for a primer bulb leak with a ten pack of from Sierra.