Mercury - Vented Splash Cover for 2.1L 115hp FourStroke Engines Engine Protection Cover Black Polysoft II Material 8M0228509. Overview. There's something comforting about knowing your engine is protected, even when the weather turns or the chop gets rough. That's why boaters who spend real time on the water appreciate a good splash cover - the kind you throw on and never think twice about. The Mercury Vented Splash Cover for 2.1L 115hp FourStroke engines brings that kind of quiet confidence. It