Sierra 18-70940 Molded Coolant Hose Thermostat to Port Manifold

The Sierra 18-70940 is a precision-engineered molded coolant hose designed specifically for MerCruiser marine engines. This OEM-quality replacement hose connects the thermostat housing to the port exhaust manifold, ensuring proper coolant flow and optimal engine temperature regulation.

Key Features:

• Designed to meet or exceed OEM specifications for reliable performance
• Custom molded construction ensures precise fit and secure installation
• Compatible with MerCruiser V-6 and V-8 engines (305, 350, and 377 cubic inch displacement)
• Engineered to withstand the harsh marine environment and high engine temperatures
• Direct replacement for Mercury MerCruiser part number 32-860144
• Also replaces Mallory part number 9-44058

Sierra marine engine parts are manufactured to stand up to the demanding conditions of marine use while providing dependable service. This molded hose is a critical cooling system component that helps maintain proper engine operating temperature and prevent overheating.