Mercury – Primer Bulb with Hose Clamps | Fuel System Components | Black Rubber | 8M0052975Mercury Primer Bulb with Hose Clamps Fuel System Components Black Rubber 8M0052975 Overview Every boater knows the little things matter, especially when youre getting ready to push off from the dock. A primer bulb may not look like much, but when it works the way it should, the whole day starts smoother. The Mercury 8M0052975 Primer Bulb gives you that quiet confidenceone squeeze, fuel moves exactly the way its supposed to, and your engine wakes up