Rein 17-12-7-535-528 Cylinder Head to Expansion Tank Coolant Hose with O-Ring

The Rein CHE0943 is an OE-quality replacement coolant water hose designed to connect the cylinder head to the coolant expansion tank. This hose includes an O-ring and is engineered to meet or exceed the original equipment specifications for a precise, leak-free fit.

Over time, coolant hoses are subjected to constant heat cycling, pressure fluctuations, and chemical exposure that cause them to degrade, crack, or swell — leading to coolant loss and potential engine overheating. Replacing a worn hose with this direct-fit Rein unit restores proper coolant flow and helps protect the engine from thermal damage.

Key Features:

• Direct OE replacement — 100% correct in form, fit, and function
• Includes O-ring for a complete, sealed installation
• Constructed from materials that meet or exceed factory specifications
• Engineered for the BMW G01 X3 and G02 X4 B46A engine applications
• Designed to withstand repeated heat cycles without cracking or degrading

Part Numbers / Cross-References:

• Rein Part Number: CHE0943
• OEM BMW Part Number: 17127535528 (also referenced as 17-12-7-535-528, 17 12 7 535 528, 17.12.7.535.528)
• UPC: 888544125867

Rein Automotive has been supplying OE-quality replacement parts to the European import market since 2007. The name "Rein" — meaning "pure" in German — reflects the brand's commitment to quality and reliability across its full line of coolant hoses, suspension components, and undercar parts.