Sierra 18-70956 Marine Engine Molded Cooling Hose

The Sierra 18-70956 is a precision-molded marine engine cooling hose designed to connect the thermostat housing to the oil cooler on MerCruiser stern drive engines. This OEM replacement hose is engineered specifically for thermostat housings with a flat top cover and four hose connectors cast directly into the housing, eliminating the need for T-connectors.

Key Features:

• Premium molded rubber construction designed for harsh marine environments
• 1-1/4 inch (32mm) inside diameter for optimal coolant flow
• Precision-molded design ensures proper fit and routing between oil cooler and thermostat housing
• Dual hose configuration: two hoses connect to manifold, two to elbow
• Engineered to meet or exceed OEM specifications
• Backed by Sierra's limited lifetime warranty

This cooling system hose is manufactured from quality marine-grade materials to withstand the demanding conditions of marine engines. The precise molded shape ensures proper clearance and eliminates the kinking or collapse issues common with universal hoses. Replaces MerCruiser 32-16012 and Mallory 9-44084.