Description
SIERRA MerCruiser Alpha One Gen II U-Joint Bellows Flange Ring – 18-1728
A retaining/flange ring used to secure the U-joint bellows on compatible Alpha One Gen II transom assemblies.
- Application: MerCruiser Alpha One Gen II sterndrives using OEM flange ring 816607.
- Component/function: U-joint bellows flange ring
- Key specification: Drive family: Alpha One Gen II
- OEM / aftermarket cross-reference: MerCruiser: 816607
- Use the applicable OEM service procedure and inspect mating components during installation.
This is an application-specific marine service part. Confirm the engine or sterndrive model, serial range and OEM reference before installation.
Application: MerCruiser Alpha One Gen II sterndrives using OEM flange ring 816607.
Specifications
- Component: U-joint bellows flange ring
- Drive family: Alpha One Gen II
- OEM reference: 816607
Interchange / Replaces
- MerCruiser: 816607
Related Products
- Upsell / complete repair: SIE-18-2747
- Cross-sell / related: SIE-18-9031-1
- Relationship notes: 18-2747 is the Sierra Alpha One Gen II drive-shaft/U-joint bellows; 18-9031-1 is bellows adhesive.

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