Sierra 18-8206-1 Transom Seal Kit for MerCruiser Alpha One Gen II, Replaces 30-803099T1

The Sierra 18-8206-1 Transom Seal Kit is a transom repair kit built for MerCruiser Alpha One Gen II stern drives. It is used to reseal the transom assembly where the drive shaft housing passes through the boat's transom, replacing the water intake hose and hose clamps that seal this critical connection between the engine compartment and the outdrive. Keeping this seal in good condition helps prevent water intrusion into the boat and exhaust or coolant leakage at the transom, both common failure points as the original hoses and clamps age and harden.

This kit contains a water intake hose (Sierra 18-3602, O.E. 32-41725-33) along with two smaller hose clamps (Sierra 18-710-16-2) and one larger hose clamp (Sierra 18-710-24-2), giving the installer everything needed to reseal the water intake path in one purchase. It is sold and priced per package of 5 kits, which suits shops and repowers servicing multiple units or keeping stock on hand. The kit directly replaces OEM part 30-803099T1 and is designed to fit MerCruiser Alpha One Gen II drive systems.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8206-1
• Product Type: Transom Seal Kit
• Category: MerCruiser I/O Drive System
• Fitment: MerCruiser Alpha One Gen II
• Package Quantity: 5 kits per package (priced per package)
• Kit Contents: Water Intake Hose (18-3602, O.E. 32-41725-33) x1, Hose Clamp (18-710-16-2) x2, Hose Clamp (18-710-24-2) x1
• Weight: 4.55 pounds
• Country of Origin: China

Fitment

• MerCruiser Alpha One Gen II

Replaces (OEM)

• 30-803099T1

Frequently Asked Questions

What does the Sierra 18-8206-1 Transom Seal Kit fit? The 18-8206-1 kit is designed for MerCruiser Alpha One Gen II stern drive systems, sealing the transom area where the drive shaft housing passes through the boat's transom.

What OEM part number does 18-8206-1 replace? It replaces OEM part number 30-803099T1, so any listing or parts diagram referencing that number matches the Sierra 18-8206-1 Transom Seal Kit.

What is included in the transom seal kit? The kit includes one water intake hose (Sierra 18-3602, O.E. 32-41725-33), two smaller hose clamps (Sierra 18-710-16-2), and one larger hose clamp (Sierra 18-710-24-2).

How many kits come in one package? The 18-8206-1 is sold in a package of 5 kits and priced per package, not per individual kit.

How much does the transom seal kit weigh? The Sierra 18-8206-1 Transom Seal Kit weighs 4.55 pounds.

Is this a genuine Sierra part or an aftermarket copy? The 18-8206-1 is a genuine Sierra-branded transom seal kit manufactured as a direct replacement for MerCruiser Alpha One Gen II drives, not a generic clone.

Where is the Sierra 18-8206-1 manufactured? The transom seal kit is manufactured in China under the Sierra brand.

Why does the transom seal need to be replaced? Over time the water intake hose and clamps in the transom assembly harden and crack, which can allow water intrusion or leaks at the transom on Alpha One Gen II drives; the 18-8206-1 kit provides fresh replacement hose and clamps for this repair.

Does the kit include the transom seal itself or just hoses and clamps? The 18-8206-1 package contains the water intake hose and its three hose clamps used to reseal this connection; it does not list a separate rubber transom gasket beyond these components.

Will the 18-8206-1 kit work on a Bravo or Alpha One Gen I drive? The 18-8206-1 Transom Seal Kit is specified for MerCruiser Alpha One Gen II drives; fitment for other drive generations is not stated for this part number.

What is the O.E. Number for the water intake hose in this kit? The water intake hose included in the Sierra 18-8206-1 kit corresponds to O.E. Number 32-41725-33.