Mercury - Vented Splash Cover FourStroke V6 Series Polysoft II Marine Material 8M0228512. Overview. When you spend a lot of time on the water, you start to appreciate the gear that quietly does its job without calling attention to itself. That is exactly how this Mercury Vented Splash Cover feels on a long run-steady, dependable, and almost invisible until you remember how clean the engine still looks at the end of the day. I have run enough chop and spray to know how quickly water spots and sal