Sierra 18-70938 Exhaust Manifold Molded Cooling Hose

The Sierra 18-70938 is a high-quality molded hose designed for connecting the thermostat housing to the port exhaust manifold on Mercruiser and Mercury marine engines. This OEM replacement hose meets or exceeds original equipment specifications, ensuring reliable performance and proper fit for your marine cooling system.

Key Features:

• Designed for Mercruiser and Mercury GM V6/V8 engines (305 and 350 CID)
• Fits 4.3L-LX (1993-96) Design III, 5.0L-LX (1988-95) Design III, 350 Mag-EFI-MPI (1987-1996), and 5.7L-LX (1986-96) Design III
• Precision-molded construction for exact fit and leak-free performance
• Marine-grade materials resist corrosion and high temperatures
• Includes one molded hose per package

Cross-Reference Information:

• Replaces Mallory 9-44057 and Mercruiser Stern Drive 32-8066351
• OEM part number: Mercury 32-8066351

This genuine Sierra replacement hose is manufactured to strict quality standards, providing a direct OEM replacement for your marine engine's cooling system. The pre-formed design ensures proper routing and prevents kinking or collapse under operating conditions.