Sierra Molded Cooling Hose 18-70704, EPDM, for MerCruiser I/O, Replaces OEM 32-89653

The Sierra 18-70704 is a molded cooling system hose built for MerCruiser I/O engines. Rather than a straight, flexible tube that has to be forced into shape, this hose is molded to its final bend so it delivers full, unrestricted water flow through the exact curve required by the cooling system, while also making installation straightforward since the shape is already correct before it goes on the boat. The hose is constructed from EPDM tubing with a synthetic knit reinforcement layer, a combination chosen for resistance to the heat, oil exposure, and constant flex that raw water and fresh water cooling hoses see in a marine engine bay. Sierra builds this hose to OEM quality standards so that fit, form, and function match the original equipment it is designed to replace, including cross reference to OEM part 32-89653. It is finished in white EPDM and supplied as a single hose weighing 0.22 pounds. Boat owners and marine techs use this hose when servicing or rebuilding the cooling system on a MerCruiser I/O engine and want a direct, correctly shaped replacement rather than a universal straight hose that has to be trimmed and bent by hand.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-70704
• Application: MerCruiser I/O Cooling System
• Material: EPDM with synthetic knit reinforcement
• Color: White
• OEM Cross Reference: 32-89653
• Weight: 0.22 pounds
• Package Length: 6.4 centimeters
• Package Height: 13.5 centimeters
• Package Width: 11 centimeters
• UPC: 030999568052
• Unit Count: 1

Fitment

Designed for MerCruiser I/O engine cooling systems.

Replaces (OEM)

• 32-89653

Frequently Asked Questions

What engines does the Sierra 18-70704 hose fit? The Sierra 18-70704 molded hose is designed for MerCruiser I/O engine cooling systems.

What OEM part number does this hose replace? Sierra 18-70704 cross references to OEM part number 32-89653.

What material is the 18-70704 hose made from? It is made from EPDM tubing with a synthetic knit reinforcement layer, chosen for resistance to heat, oil exposure, and repeated flexing in a marine cooling system.

Is this hose pre-shaped or a straight piece I have to bend? The 18-70704 is molded to its final bend shape, so it provides full water flow through the required curve without needing to be manually formed or clamped into position.

What color is the Sierra 18-70704 hose? This molded cooling hose is white EPDM.

How much does the 18-70704 hose weigh? The Sierra 18-70704 weighs 0.22 pounds.

Is the Sierra 18-70704 an OEM-quality replacement? Yes, Sierra manufactures the 18-70704 to OEM quality standards so it matches the fit, form, and function of the original hose it replaces, including OEM number 32-89653.

How many hoses come in the package? The 18-70704 is sold as a single molded hose (unit count of 1).

Can this hose be used for both raw water and fresh water cooling circuits? The 18-70704 is a cooling system hose intended for MerCruiser I/O engines and is built to handle the flow demands of the engine's cooling system plumbing.

What are the package dimensions of the 18-70704? The Sierra 18-70704 ships in a package measuring 6.4 centimeters long, 13.5 centimeters high, and 11 centimeters wide.

Does the 18-70704 include any hose clamps or fittings? The 18-70704 is supplied as the molded hose itself; no additional components are listed with it.

Why choose a molded hose instead of a universal flexible hose? A molded hose like the 18-70704 is shaped to the exact bend needed in the cooling system, which maintains full water flow and avoids the kinking or restriction that can occur when a straight universal hose is bent into place.