Mercury - Vented Splash Cover FourStroke V6 Series Polysoft II Marine Material 8M0228511. Overview. There is a certain comfort in heading out at sunrise knowing your engine has the extra protection it needs. I have run enough early-morning channels and windy afternoons to appreciate the difference a good splash cover makes. With this Mercury Vented Splash Cover on a 3.4L V6 200 horsepower FourStroke, the engine feels cared for before you even leave the dock. You get that quiet sense of confidenc