Quicksilver O-Ring 30529 – Mercury MerCruiser OEM (5-Pack)
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Quicksilver O-Ring 30529 (5-Pack)
O-rings are a one-time-use seal — every time a joint is disassembled, a fresh one should go back in. This 5-pack of genuine OEM O-rings gives you the right quantity for a full service job or keeps spares on hand for the next one. These are precision-molded to the exact compound, durometer, and dimensions specified for Mercury and MerCruiser assemblies — not generic O-rings that happen to be close in size.
Key Specifications
- Part Number: 30529
- Quantity: 5-pack
- Type: O-Ring
- Material: Marine-grade compound, resistant to fuel, oil, and saltwater
- Genuine OEM — not aftermarket
Common Applications
Use these O-rings wherever the Mercury or MerCruiser parts diagram specifies part number 30529. They appear across multiple engine and drive assemblies to seal fluid passages, housings, and fittings — always verify against your model’s current parts diagram, serial number, and assembly location before ordering.
When to Replace
Replace any time you disassemble a sealed joint and the existing O-ring shows signs of flattening, cracking, hardening, swelling, or surface contamination. Never reuse an O-ring that has been compressed in service — always install a fresh one on reassembly.
Installation Notes
Clean mating surfaces thoroughly before installation. Lightly lubricate the O-ring with the appropriate fluid (fuel-safe grease or the system fluid) to ease installation and prevent tearing. Follow the Mercury service manual for orientation and torque specifications on the surrounding hardware.
Related Products
Parts Desk Insights
Best used during fuel system, cooling system, or drive service where the parts diagram calls for 30529. The 5-pack format is ideal for full engine or drive rebuilds where multiple O-rings of the same size are replaced in one job, or for keeping a service stock on hand. Always match by part number — O-rings that look identical can differ in compound and will fail prematurely in the wrong application. If your assembly has been repowered or updated, cross-reference the current diagram to confirm this number hasn’t been superseded.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.