Sierra is a leading supplier of primer bulbs to the marine aftermarket. Our bulbs use double check valves with viton balls and stainless steel springs, as well as Floroelastomer (FKM) material for traditional look and operation.

For Mercury Optimax 75 hp through 115 hp 2-stroke outboards and Mercury 30 hp through 350 hp 4-stroke outboards, and MerCruiser Alpha One Gen II and Vazer sterndrives. See your owner’s manual for replacement schedule.

This is a genuine Mercury Marine factory OEM part, not aftermarket
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