O RING,3.975X.210 (8M0035893) – Mercury

For use on 150 hp EFI FourStroke outboards.

Features:?

Kit includes: oil filter, fuel filters, gearcase drain seals, 4 spark plugs, thermostat kit, water impeller kit, alternator belt, and anodes.

Includes all parts Mercury Marine recommends for your 300 hour service.