Sierra Transom Seal 18-2724, Replaces 24-17997A1, for Alpha I Gen II and Bravo I, II, III Drives

The Sierra 18-2724 Transom Seal is a white, round transom seal engineered to fit Alpha I Generation II and Bravo I, II, and III drives. It seals the gap where the drive shaft housing passes through the transom assembly, helping to keep water out of the bilge and boat interior at this critical hull penetration point. Installing a properly fitted transom seal is a routine part of stern drive maintenance, and using the correct part number for your specific drive generation is essential to maintain a watertight seal.

This seal is manufactured by Sierra, a long-established supplier of marine engine and drive parts, and is built to meet or exceed the performance of the original equipment part it replaces. It directly replaces OEM part number 24-17997A1, making it a straightforward like-for-like swap for boat owners and marine technicians servicing Alpha I Generation II and Bravo I, II, and III drive units.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2724
• Product Name: Transom Seal
• Color: White
• Shape: Round
• Weight: 0.13 pounds

Fitment

• Alpha I Generation II Drives
• Bravo I, II, and III Drives

Replaces (OEM)

• 24-17997A1

Frequently Asked Questions

What drives does the Sierra 18-2724 transom seal fit? The Sierra 18-2724 transom seal is designed for Alpha I Generation II drives and Bravo I, II, and III drives.

What OEM part number does 18-2724 replace? This transom seal replaces OEM part number 24-17997A1.

What color is the Sierra 18-2724 transom seal? It is white.

What shape is the transom seal? The Sierra 18-2724 is a round transom seal.

How much does the Sierra 18-2724 transom seal weigh? It weighs 0.13 pounds.

Is the Sierra 18-2724 a genuine Sierra part or an aftermarket copy? Sierra 18-2724 is a Sierra-branded transom seal manufactured to meet or exceed the performance of the original equipment part it replaces.

Will 18-2724 work on a standard Bravo drive as well as Bravo II and III? Yes, the Sierra 18-2724 transom seal is listed for Bravo I, II, and III drives, in addition to Alpha I Generation II drives.

What is the purpose of a transom seal on a stern drive boat? A transom seal such as the Sierra 18-2724 seals the opening where the drive shaft housing passes through the boat transom, helping prevent water intrusion into the bilge.

Does the Sierra 18-2724 fit Alpha I Generation I drives? No, the Sierra 18-2724 is specified for Alpha I Generation II drives, not Generation I.

Can I use 18-2724 as a direct replacement without modification? Yes, the Sierra 18-2724 transom seal is designed as a direct replacement for OEM part 24-17997A1 on Alpha I Generation II and Bravo I, II, and III drives.