Quicksilver U-Joint Bellows — MerCruiser Alpha One Gen II & Vazer Sterndrives — 816431A1
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Quicksilver U-Joint Bellows — MerCruiser Alpha One Gen II & Vazer Sterndrives — 816431A1
Keep water out of your bell housing with the Quicksilver U-Joint Bellows 816431A1. Designed specifically for MerCruiser Alpha One Gen II sterndrives (1991 and newer) and Vazer drives, this flexible ribbed bellows is a critical seal that protects your drivetrain from water intrusion. Hose clamps for both ends are included for a complete, ready-to-install repair.
Key Features
- Flexible ribbed composite construction seals the bell housing against water entry
- Direct-fit replacement for MerCruiser Alpha One Gen II (1991+) and Vazer sterndrives
- Hose clamps included for both ends — no additional hardware required
- Installs with common hand tools
Compatibility
- MerCruiser Alpha One Gen II sterndrive — 1991 and newer
- Vazer sterndrive
- Verify compatibility with your specific drive serial number before ordering
Parts Desk Insights
Best use case: The U-joint bellows is a wear item that should be inspected at every annual service and replaced at the first sign of cracking, stiffness, or water intrusion. Failure of this bellows allows water into the bell housing, which can cause rapid corrosion and catastrophic damage to the U-joint and gimbal bearing. Ideal for DIY owners performing their own annual sterndrive service and for marine technicians doing Alpha One Gen II drive reseals. If you’re replacing the U-joint bellows, it’s best practice to inspect and replace the shift cable bellows and exhaust bellows at the same time to avoid a repeat haul-out. Confirm drive model and serial number before ordering.
Shipping: Locally warehoused, ships within 3 days. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.