Mercury - Vented Splash Cover 8M0228513. Everyday protection for your 200 HP inline-six cowling-on the water and on the road.. Give your Mercury 200 HP L6 the kind of coverage you will actually use. This vented splash cover is precision-cut to match the cowling shape, so it slips on quickly and stays secure without loose fabric flapping at speed. The Polysoft II marine-grade shell is designed to block most spray while still allowing airflow, helping reduce trapped moisture that can lead to milde