Rein 17-12-5-A02-2D6 Radiator Coolant Vent Hose to Expansion Tank

The Rein CHE0959 is a direct-fit replacement radiator coolant vent hose designed to connect the radiator to the coolant expansion tank. This hose plays a critical role in the cooling system by allowing air and coolant vapor to vent from the radiator back to the expansion reservoir, helping to maintain proper coolant pressure and prevent overheating.

Manufactured by Rein Automotive, a trusted OEM-quality supplier specializing in European vehicle components, this hose is engineered to meet original equipment specifications for precise fitment and long-lasting performance.

Key Features:

• OEM-equivalent fit, form, and function
• Constructed from heat- and pressure-resistant rubber/silicone-blend material
• Connects radiator to the coolant expansion tank (vent/overflow circuit)
• Designed to resist cracking, splitting, and coolant degradation over time
• Drop-in replacement — no modification required

Part Number Cross-Reference:

• Rein Part Number: CHE0959
• OEM/BMW Part Number: 17-12-5-A02-2D6 / 17125A022D6
• Also replaces: 17127535527, 17129894763

This coolant vent hose is a straightforward maintenance replacement for worn or cracked original hoses and is an essential component to inspect during any major cooling system service.