Mercury - Vented Splash Cover 8M0228516. Everyday protection for your 275 HP inline-six cowling-built for running and trailering.. Keep your Mercury 275 HP L6 looking sharp with a vented splash cover that is custom-cut for the taller inline-six cowling profile. The tailored fit hugs the contours for a clean, secure hold that helps reduce flapping at speed. A Polysoft II marine-grade outer shell helps shed spray while still allowing airflow, which helps reduce trapped moisture. Inside, a soft, no