Sierra Exhaust Boot 18-2748, 4 Inch Upper Tube, Fits Mercruiser 120/140 Stern Drive & GM V-6/V-8 Engines

The Sierra 18-2748 Exhaust Boot is a marine exhaust connector designed to link the exhaust riser to the exhaust hose on inboard/outboard stern drive engines. It features a 4 inch upper tube (1016 millimeters) and is engineered for Mercruiser MCM 120 and 140 stern drives as well as GM V-6 and V-8 marine engines. This boot is intended for use with Sierra's 18-1975-1 Manifold Riser with Exhaust Tube, sealing the connection between the riser and the exhaust hose to prevent leaks of hot exhaust gas and water. Constructed with a bolt-on, round installation design, the boot ships one per package. Sierra manufactures this exhaust boot to meet or exceed the specifications of the original equipment part it replaces, making it a direct aftermarket replacement for Mercury Marine 32-44348T as well as GLM 89120, Mallory 9-72805, and Mercruiser Stern Drive 32-44348, 32-44348001, and 32-44348T. As with all Sierra marine parts, it is backed by Sierra's industry-leading customer satisfaction warranty. Boat owners and marine technicians running compatible Mercruiser stern drive or GM V-6/V-8 setups can use this boot to restore a proper seal at the exhaust riser during routine maintenance or when replacing a cracked, hardened, or leaking original boot.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2748
• Item Type: Exhaust Boot
• Upper Tube Diameter: 4 inches (1016 millimeters)
• Shape: Round
• Installation Type: Bolt-On
• Number of Items: 1 exhaust boot per package
• Weight: 0.77 pounds
• UPC: 030999752963
• OEM Equivalent Part Number: Mercury Marine 32-44348T
• OEM Cross-Reference: GLM 89120, Mallory 9-72805, Mercruiser Stern Drive 32-44348, 32-44348001, 32-44348T
• Use With: Sierra 18-1975-1 Manifold Riser with Exhaust Tube

Fitment

• Mercruiser MCM 120 stern drive
• Mercruiser MCM 140 stern drive
• GM V-6 and V-8 marine engines

Replaces (OEM)

• GLM 89120
• Mallory 9-72805
• Mercruiser Stern Drive 32-44348
• Mercruiser Stern Drive 32-44348001
• Mercruiser Stern Drive 32-44348T

Frequently Asked Questions

What engines does the Sierra 18-2748 exhaust boot fit? This exhaust boot is designed for Mercruiser MCM 120 and 140 stern drives as well as GM V-6 and V-8 marine engines.

What size is the upper tube on this exhaust boot? The upper tube on the 18-2748 measures 4 inches (1016 millimeters) in diameter.

Is the Sierra 18-2748 a genuine Sierra part or aftermarket? It is a genuine Sierra part manufactured to meet or exceed the specifications of the original equipment part it replaces.

Does the 18-2748 boot replace Mercury Marine 32-44348T? Yes, the 18-2748 is an equivalent replacement for Mercury Marine part number 32-44348T.

What other OEM part numbers does this boot cross-reference to? The 18-2748 crosses to GLM 89120, Mallory 9-72805, and Mercruiser Stern Drive numbers 32-44348, 32-44348001, and 32-44348T.

How much does this exhaust boot weigh? The Sierra 18-2748 exhaust boot weighs 0.77 pounds.

What other part does the 18-2748 boot install with? It is intended for use with Sierra's 18-1975-1 Manifold Riser with Exhaust Tube.

How many exhaust boots come in the package? One exhaust boot is included per package for part number 18-2748.

What is the installation type for the 18-2748 boot? The 18-2748 uses a bolt-on, round installation design.

Is the Sierra 18-2748 covered under warranty? Yes, this exhaust boot is covered under Sierra's customer satisfaction warranty like all Sierra marine parts.

Why would I need to replace an exhaust boot like the 18-2748? Exhaust boots harden and crack with age and heat exposure, so a boot like the 18-2748 is typically replaced when the original seal at the exhaust riser starts leaking exhaust gas or water.

What is the manufacturer part number for this exhaust boot? The manufacturer part number is 18-2748.