YZQPNB Transom Seal Repair Kit for MerCruiser Alpha One Gen 2 (1991+) — Exhaust Bellows Replacement

The YZQPNB Transom Seal Repair Kit restores a watertight exhaust transom seal for MerCruiser Alpha One Gen 2 sterndrives (1991 and later).

If your MerCruiser Alpha One Gen 2 has a cracked or compressed transom bellows, this repair kit contains the parts needed to reseal the exhaust passage and reduce the risk of water intrusion. The kit replaces multiple OEM references, fits Gen 2 Alpha One sterndrives from 1991 onward, and is intended to help you rebuild the sealing assembly without replacing the entire outdrive. It’s supplied with the components shown in the product diagram and backed by seller support to answer fitment or installation questions.

How does this kit match my MerCruiser Alpha One Gen 2?

This repair kit is engineered to be compatible with MerCruiser Alpha One Gen 2 sterndrives starting in 1991. It replaces the common OEM part numbers used for transom bellows and seals so it aligns with factory dimensions and mounting points.

• Direct compatibility with Alpha One Gen 2 models from 1991 and later.
• Replaces OEM references 803099T1 and equivalents for accurate fit.
• Designed to fit the exhaust/transom bellows area without modification.

What parts and references does the kit replace?

The kit substitutes several original-equipment numbers so you can expect it to serve as a like-for-like replacement for worn components. It is commonly cross-referenced by aftermarket suppliers and part catalogs.

• OEM part 803099T1 and Sierra Marine references including 30-803099T1.
• Other equivalents: 18-8206, 18-8218, GLM Marine 21960, Mallory 9-72900.
• Also used as an alternative to OBR/Red Rhino MR-907 and Marine 9A-116 fittings.

How will replacing the transom bellows help my boat’s performance?

Renewing the transom bellows helps maintain a proper exhaust seal, which in turn reduces the chance of water entering the exhaust path and reaching the engine compartment. While it does not change engine power, it supports reliable exhaust routing and reduces moisture-related risks that can affect performance components.

• Restores a secure exhaust-to-transom seal to help prevent water entry.
• Reduces the chance of exhaust leaks that could allow water into the boat.
• Supports long-term reliability by replacing aged, brittle bellows material.

What comes in the package and where can I get help installing it?

The box contains the parts illustrated in the included diagram so you can reassemble the transom seal area. If you need assistance with fitment or installation details, the seller offers support—reach out with your questions and they’ll help resolve fit or component concerns.

• Kit includes all components shown in the product diagram for resealing the transom bellows.
• Manufacturer and seller support available for fitment and installation queries.
• Installation typically requires basic hand tools and a clean mating surface.

Who is this for: This transom seal repair kit is intended for boat owners, mechanics, and marinas maintaining MerCruiser Alpha One Gen 2 sterndrive boats from 1991 onward who need a reliable aftermarket replacement for worn bellows and seals. It’s suited to DIY installers comfortable removing the outdrive or to professional technicians performing routine sterndrive maintenance and reseal work.