Mercury - Vented Splash Cover Pro XS V8 Series Polysoft II Marine Material 8M0228536. Overview. There is a certain comfort that comes from knowing your engine is protected while you are out there doing what you love. When I slip this Mercury Vented Splash Cover over a Pro XS V8, it feels like preparing a trusted partner before pushing off from the dock. You hear that first rumble of the engine under the cover, and you can almost feel the protection working-no harsh spray pounding the cowl, no sa