Sierra 18-2748 Exhaust Bellows 4in x 4.25in for MerCruiser

The Sierra 18-2748 is a replacement exhaust bellows designed for MerCruiser and GM marine engines. This single exhaust boot features a 4-inch upper tube diameter and measures 4.25 inches in length, providing a critical seal between the exhaust manifold and the transom assembly.

Key Features:

• 4-inch upper tube diameter for proper exhaust flow
• 4.25-inch overall length
• Direct replacement for MerCruiser part number 279009
• Compatible with MCM 120/140 engines
• Fits GM V-6 and V-8 marine engine applications
• Durable rubber construction resists heat and marine environment

This exhaust bellows is an essential component of the sterndrive exhaust system, protecting the transom shield from exhaust gases and water intrusion. Regular inspection and replacement of exhaust bellows prevents costly water damage to the boat's transom and engine compartment.