Mercury - Water Pump Repair Kit Cooling System Components Marine-Grade Elastomers 8M0122064. Overview. Every boater knows that a good day on the water depends on an engine that stays cool and calm, no matter how hard it's working. Whether you're creeping through a shallow creek at sunrise or running wide open toward open water, that steady cooling flow is something you can actually feel-quiet, dependable, almost like a heartbeat beneath your feet. When it's time to refresh that system, you want