Sierra 18-3602 Water Intake Hose for Mercruiser MR, Alpha One and Gen II Drives

The Sierra 18-3602 is a water intake hose engineered as a direct replacement for Mercruiser MR, Alpha One, and Gen II sterndrive applications. This hose carries raw water from the intake to the engine's cooling circuit, a critical connection point where cracking, hardening, or collapse can quickly lead to overheating. The 18-3602 measures 13 7/8 inches in length with a 3/4 inch outside diameter, sized to match factory routing without modification, and its universal fit design allows it to be trimmed or positioned to suit the specific installation.

Built from glass-reinforced hose material in white, it is designed to withstand the flexing, vibration, and constant exposure to raw water and engine-bay heat that marine intake hoses see in service. Sierra manufactures this hose to meet or exceed the specifications of the original equipment part it replaces, and it is intended as a straightforward swap for aging, cracked, or collapsed intake hoses on covered drive applications.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3602
• Product Category: Mercruiser Hoses
• Material: Glass
• Color: White
• Length: 13 7/8 inches (3524 mm)
• Outside Diameter: 3/4 inch (191 mm)
• Fits: MR, Alpha One and Gen II drives
• Fit Type: Universal Fit
• UPC: 808282258818
• Weight: 0.47 pounds

Fitment

• Mercruiser MR sterndrive
• Mercruiser Alpha One sterndrive
• Mercruiser Alpha Gen II sterndrive

Replaces (OEM)

• 32-41725-33

Frequently Asked Questions

What drives does the Sierra 18-3602 water intake hose fit? The 18-3602 is designed to fit Mercruiser MR, Alpha One, and Gen II sterndrive applications.

What size is this intake hose? It measures 13 7/8 inches (3524 mm) in length with a 3/4 inch (191 mm) outside diameter.

What OEM Mercruiser part number does the 18-3602 cross to? The Sierra 18-3602 corresponds to Mercruiser part number 32-41725-33.

What material is the hose made from? The 18-3602 is made from glass-reinforced hose material in white.

How much does the 18-3602 water intake hose weigh? It weighs 0.47 pounds.

Is this a universal-fit hose or a fixed-length hose? The 18-3602 is a universal-fit hose, meaning it can be positioned or trimmed to suit the specific installation on MR, Alpha One, and Gen II drives.

Is the Sierra 18-3602 equivalent to the OEM Mercruiser part? Yes, Sierra manufactures the 18-3602 to meet or exceed the specifications of the original Mercruiser equipment part it replaces (32-41725-33).

When should I replace my water intake hose? A water intake hose like the 18-3602 should be replaced when it shows cracking, hardening, or collapse, since a failing intake hose can restrict raw water flow and lead to engine overheating.

What color is the 18-3602 hose? The 18-3602 is white in color.

Does the 18-3602 include clamps or fittings? The 18-3602 is the water intake hose itself; clamps and fittings are not called out as included components.

Who makes the 18-3602 hose? The 18-3602 water intake hose is manufactured by Sierra, a supplier of marine engine parts to OEM engine manufacturers and boat builders.