Rein 17-12-7-509-966 Expansion Tank Coolant Hose Lower Fitting

The Rein 17-12-7-509-966 is an engine coolant hose designed to connect the expansion tank lower fitting to the cooling system on BMW X5 vehicles. This critical cooling system component allows coolant to circulate between the expansion tank and other cooling system components, maintaining proper engine temperature and preventing overheating.

Key Features:

• Direct OE replacement design for precise fit and function
• Integrated thermoplastic quick-connect fittings for easy installation
• Premium rubber construction resistant to electrochemical cracking
• High strength materials withstand extreme temperatures and pressures
• Resistant to coolant mixtures, oil, salt, road debris, and ozone
• Pre-formed to exact OE specifications - no cutting or modification required
• Features O-ring seals for leak-free connections

Rein Automotive specializes in OE-quality cooling system components designed to match original equipment specifications. This expansion tank hose is engineered with the same dimensions, materials, and connection points as the factory part, ensuring reliable performance and durability. The hose is designed to handle the thermal expansion and contraction of coolant as the engine heats and cools, preventing pressure buildup and maintaining optimal coolant levels throughout the system.

OEM Cross Reference: BMW 17127509966