Mercury MerCruiser End Cap O-Ring 25-35126
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Mercury MerCruiser Quicksilver End Cap O-Ring 25-35126 is a replacement sealing O-ring used on select Mercury / MerCruiser outboard and sterndrive-related applications where this end cap seal is specified. It is commonly referenced for Mercury / MerCruiser 65–300 HP applications and is used to help restore a proper seal at the end cap assembly.
Key Features
- Replacement end cap O-ring for Mercury / MerCruiser applications
- Commonly referenced as 25-35126 and 35126
- Also associated with reference number 526-15
- Used on select Mercury / MerCruiser 65–300 HP applications
- Helps prevent leaks at the serviced end cap sealing point
Engine Compatibility
Used on select Mercury / MerCruiser applications in the 65–300 HP range where part number 25-35126 / 35126 is specified.
Serial Number Fitment Notice
Mercury fitment can vary by model, horsepower, serial number, and assembly version. Confirm fitment against your engine serial number or parts diagram before ordering.
When This Part Needs Replacement
Replace this O-ring when servicing the end cap, or if the original seal is flattened, brittle, cracked, swollen, cut, or leaking.
Installation Notes
Clean the end cap groove and mating surface before installation. Install the O-ring evenly without twisting or pinching. Replace the seal rather than reusing the old one during reassembly.
Alternate/Superseded Part Numbers
- 25-35126
- 35126
- 526-15
Parts Desk Insight
This is the kind of small Mercury sealing part where the prefix makes the difference. Searching only 35126 can miss the useful references, while 25-35126 brings up the correct O-ring context much faster.
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.