Mercury MerCruiser Quicksilver O-Ring 1.424 x .103 457101
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Mercury MerCruiser Quicksilver 25-457101 is an OEM-style O-ring used in select Mercury, Mariner, and MerCruiser gearcase and drive assemblies. Mercury parts references identify this part as O-RING (1.424 x .103) and show the older 25-457101 / 457101 reference superseding to the current replacement 25-8M0204681 / 8M0204681.
Key Features
- Genuine Mercury / Quicksilver-style O-ring reference
- Size reference: 1.424 in. I.D. x .103 in. width
- Commonly shown as an orange O-ring in current parts listings
- Original Mercury reference: 25-457101 / 457101
- Current replacement reference: 25-8M0204681 / 8M0204681
- GTIN reference for 25-457101: 745061532595
Engine Compatibility
This O-ring is associated with select Mercury and Mariner outboard gearcase applications, including many 40–115 EFI, 75/90/115 DFI / Optimax, and related 30–125 HP gearcase families depending on model and serial number. Cross-reference application data also shows use in MerCruiser Bravo drive shaft housing exploded views and related gearcase component groups.
Serial Number Fitment Notice
O-ring fitment depends on the exact engine, drive, gear housing, diagram location, and serial number range. Always confirm compatibility using the Mercury or MerCruiser serial number before ordering, especially where older 25-457101 has been replaced by 25-8M0204681.
When This Part Needs Replacement
Replace this O-ring when servicing the related gearcase or drive housing component, or whenever the original O-ring is flattened, cut, brittle, swollen, cracked, missing, or no longer sealing properly. Reusing an old O-ring can lead to leaks and repeat service.
Installation Notes
Clean the O-ring groove and mating surface before installation. Lightly lubricate the O-ring with the service-manual-approved lubricant where specified, and make sure it seats evenly without twisting or pinching. Confirm the exact diagram location before installation, as this size O-ring appears across multiple Mercury and MerCruiser assemblies.
Alternate / Superseded Part Numbers
- 25-457101
- 457101
- 25-45710
- 45710
- 25-8M0204681
- 8M0204681
- Sierra 18-7198
- GLM 81270 / 81275
- OMC / Johnson / Evinrude 0308626, 0508504, 0777523, 308626
- Honda 91353-ZW1-003
Parts Desk Insight
Small O-rings like this are easy to overlook during gearcase service, but they are usually not worth reusing. Matching the O-ring by part number and serial-number diagram location is the safest approach because the same seal size can appear in several different Mercury and MerCruiser assemblies.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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.