Rein 17-12-8-651-298 Coolant Expansion Tank to Upper Radiator Overflow Hose

The Rein 17-12-8-651-298 is a direct-fit replacement coolant overflow hose engineered to connect the expansion tank to the upper radiator hose in BMW closed-loop cooling systems. This hose routes coolant back to the overflow or recovery bottle, playing a critical role in maintaining proper coolant levels and preventing air pockets in the cooling circuit.

Manufactured by Rein Automotive, a brand of CRP Automotive with a longstanding reputation for OE-quality European replacement parts, this hose is built to match the original equipment specifications exactly — including pre-formed bends, connector geometry, and material composition. Premium reinforced rubber construction delivers superior resistance to heat, pressure, and the chemical demands of modern BMW coolant systems.

Key Features:

• Direct OE replacement — matches original form, fit, and function
• Reinforced rubber construction for long-term durability and flexibility
• Superior heat and pressure resistance to endure extreme engine conditions
• Precision pre-formed bends for a trouble-free, no-modification installation
• Engineered to meet or exceed original BMW specifications

OEM & Cross-Reference Part Numbers:

• 17-12-8-651-298 / 17128651298 (BMW OEM)
• Supersedes: 17127601850, 17127601859

Replacing a cracked, swollen, or leaking expansion tank hose is essential preventive maintenance. Coolant loss caused by a failed hose can quickly lead to engine overheating and costly repairs. The Rein 17-12-8-651-298 restores cooling system integrity and helps protect your engine for miles to come.