Mercury – Quicksilver Upper Driveshaft Housing Seal | Sterndrive Component | Marine-Grade Rubber | 12708

Overview

Every boater knows that keeping water out of your drive is half the battle. The Mercury Marine 12708 Quicksilver Upper Driveshaft Housing Seal is a small part that quietly protects one of the most critical sections of your MerCruiser Bravo drive. It’s made for long, hard use — the kind where salt, pressure, and vibration are constant. Swap this seal any time you open up the upper housing, and you’ll be locking in smooth operation, clean gear lube, and the peace of mind that your drive’s protected for another season.

Key Features

• Purpose: Seals the upper driveshaft housing to prevent water intrusion and gear oil leaks.
• Construction: Crafted from flexible marine-grade rubber that maintains its seal under pressure and heat.
• Design Detail: Cut and molded to OEM Mercury Marine tolerances for a perfect, reliable fit.
• Durability: Resistant to oil, saltwater, and temperature swings that can break down standard materials.
• Performance: Keeps internal gears, bearings, and shafts running clean and properly lubricated.
• Maintenance Tip: Replace this seal whenever the upper housing is removed or serviced.

Engine & Boat Compatibility

• Fits all MerCruiser Bravo sterndrives, including Bravo One, Bravo Two, and Bravo Three.
• Common on sport cruisers, offshore fishing boats, and high-performance runabouts using Bravo drives.
• Works equally well in freshwater and saltwater conditions.
• Designed for maintenance, rebuilds, or resealing when working on the upper driveshaft housing.

Performance & Practical Benefits

A good seal is one of those things you never notice — until it fails. The 12708 Upper Driveshaft Housing Seal is built to prevent that headache. Its rubber compound stays flexible even after years of heat cycles, so it won’t dry out or shrink. It holds tight against vibration and pressure changes, keeping your gear oil clean and your bearings protected.

Once installed, it restores that solid, leak-free confidence that keeps you out on the water longer. It’s not the kind of part that shows off, but it’s one of the reasons your MerCruiser feels strong and runs smooth every time you throttle up.

Why Buy OEM

Aftermarket seals can look the same, but the difference shows up in the fit. A seal that’s even slightly off can let water in or leak gear lube under pressure. The Quicksilver 12708 is a genuine Mercury Marine part, built to the same exact specs as the original equipment on your Bravo drive.

With OEM parts, you know you’re getting materials that were designed to handle marine use — salt, oil, and heat included. It’s the kind of reliability that makes maintenance worth doing right the first time. For most boaters, that’s what Mercury quality is all about: install it once, and get back to boating without second-guessing your gear.

FAQ

Q1: Which MerCruiser drives does this seal fit?
It fits all Bravo sterndrives — Bravo One, Two, and Three.

Q2: Why replace it during service?
Once the housing is removed, the old seal can lose its tension. Installing a new one prevents leaks before they start.

Q3: How is it better than aftermarket versions?
Mercury’s material quality and fit precision hold up under pressure — literally. It’s designed for the real marine environment.

Q4: Can it handle saltwater use?
Yes. The marine-grade rubber resists corrosion, salt, and oil for long-term protection.

Q5: Is it easy to install?
Yes. It’s a straightforward replacement that most owners or marine techs can handle with standard tools.