Rein 17-12-7-617-377 Engine Coolant Water Hose Assembly – Auxiliary Water Pump Inlet

The Rein 17-12-7-617-377 is a replacement engine coolant water hose assembly designed to serve as the inlet line between the expansion tank and the auxiliary water pump in BMW and MINI cooling systems. This hose plays a critical role in routing coolant through the turbocharger circuit, helping regulate engine temperature and protect against overheating.

Rein Automotive is a well-regarded OEM-quality supplier of European vehicle components, manufacturing parts to original equipment standards for precise fit and long-term reliability. This hose assembly is constructed from a combination of rubber, plastic, and metal — the same multi-material design used in the original factory part — ensuring compatibility with BMW's cooling system architecture.

Key Features:

• OEM-equivalent construction using rubber, plastic, and metal materials
• Serves as the auxiliary water pump inlet hose, routing coolant to the turbocharger circuit
• Overall length approximately 634mm (24.96") with multi-port design for system integration
• Built to resist cracking, swelling, and degradation from prolonged heat and coolant chemical exposure
• Direct replacement for OEM part number 17127617377
• Also known as: Line Pump Exhaust Turboch H 171040

Coolant hoses degrade over time due to constant exposure to high temperatures and coolant chemistry. A hose in need of replacement will often feel spongy or soft when squeezed, rather than firm. Replacing this hose during a coolant flush or turbocharger service is a practical way to restore system integrity and prevent unplanned coolant leaks.