Invest in reliability with MERCURY genuine OEM part F449278. factory-spec sealing that holds up season after season — exactly what your engine was designed around.

Leaks mean downtime and expensive repairs. Don’t settle for aftermarket knockoffs. Genuine MERCURY OEM seals are engineered to exact factory specifications, not cheap imitations. Marine-grade construction withstands saltwater corrosion, constant vibration, and UV degradation that destroy inferior parts. Investing in OEM quality means avoiding leaks and contamination.

Trust the part your engine was designed around. MERCURY OEM F449278 ensures no more leaks — just reliable performance. After four decades in marine parts, we know what works: factory quality keeps you on the water and out of the repair bay. It’s that simple.

FITS: MERCURY marine engines and outboards. Verify part number F449278 with your engine’s parts diagram to ensure exact compatibility.

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STAY OUT ON THE WATER LONGER WITH GENUINE OEM PARTS FROM US BOATWORKS.

Over 2 million parts in stock including NLA and hard-to-find parts.

Can’t find what you’re looking for? Call or text us: 913-342-0011