Mercury MerCruiser Quicksilver O-Ring 8M0204645
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Genuine Quicksilver O-Ring — Part #8M0204645
Keep your Mercury or MerCruiser engine sealed and running right with this genuine Quicksilver O-Ring. Designed to OEM specification, this small but critical seal prevents fluid leaks at the assembly points where it's called out in the Mercury parts diagram. Using the correct factory O-ring — not a generic substitute — ensures a proper fit and long-lasting seal in demanding marine environments.
Fits Where the Diagram Calls It Out
This O-ring is used across a range of Mercury and MerCruiser assemblies. Always verify fitment by matching part number 8M0204645 to your engine's current parts diagram using your model number and serial number before ordering.
Frequently Ordered With
- Mercury MerCruiser Quicksilver Gasket, Inlet Seat 25033
- Mercury MerCruiser Quicksilver Lockwasher 8M0204647
Parts Desk Insights
Best use case: This O-ring is the right choice when servicing a Mercury or MerCruiser assembly that specifically calls for part number 8M0204645 in the factory parts diagram. It's commonly needed during carburetor rebuilds, fuel system service, or cooling system work where O-ring seals are replaced as part of a complete service. Always replace O-rings in sets when disassembling an assembly — pairing this part with the inlet seat gasket and lockwasher is common practice. Confirm the part number against your current Mercury parts diagram — similar O-rings vary by production range and assembly location.
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.