MerCruiser Bravo Upper Driveshaft Housing Seal 12708
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The Mercury MerCruiser Quicksilver Seal 12708 is a genuine Mercury upper driveshaft housing seal for MerCruiser Bravo sterndrives. It is a durable rubber sealing component used during upper driveshaft housing service, helping maintain proper sealing when the housing is removed and reassembled. Mercury lists this part for use on all MerCruiser Bravo drives.
Key Features
- Genuine Mercury / Quicksilver replacement seal
- Part number: 12708
- Component type: upper driveshaft housing seal
- Designed for MerCruiser Bravo sterndrives
- Durable rubber construction for marine drive service
- Replace when service requires removal of the upper driveshaft housing
- GTIN / UPC: 745061108356
- Approximate shipping weight: 0.02 lb
Drive Compatibility
Designed for use on all MerCruiser Bravo sterndrives, including Bravo I, Bravo II, Bravo III, Bravo X, Bravo XR, and related high-performance Bravo drive assemblies when confirmed by parts diagram.
Serial Number Fitment Notice
Bravo drive parts can vary by drive model, transom assembly, production range, and schematic location. Always confirm 12708 against your drive serial number, original seal, or Mercury parts diagram before ordering.
When This Part Needs Replacement
Replace this seal whenever the upper driveshaft housing is removed for service, or if the existing seal is damaged, hardened, torn, leaking, distorted, or no longer sealing correctly. Replacing the seal during related service helps prevent repeat labour and reduces the chance of water intrusion or lubricant leakage after reassembly.
Installation Notes
Install according to the Mercury service manual for the specific Bravo drive model. Clean the sealing area, inspect mating surfaces for corrosion or damage, and confirm the seal is seated correctly before reassembling the upper driveshaft housing. Pressure or vacuum testing may be required after drive service to confirm the sealing system is sound.
Alternate/Superseded Part Numbers
- Mercury / Quicksilver: 12708
- Mercury prefix reference: 710-12708
- Related aftermarket references: Sierra 18-1240, Mallory 9-78001, GLM 86720, SEI 95-121-06
Parts Desk Insight
This is a small seal, but it sits in an important Bravo drive service location. The smart move is replacing it whenever the upper driveshaft housing is apart, because reusing an old compressed seal can turn a simple service job into a leak-related comeback.
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.