Genuine BMW 11538674931 Coolant Pipe O-Ring Water Pipe Seal

The Genuine BMW 11538674931 is a factory OEM coolant pipe O-ring designed to seal the water pipe connection at the cylinder head. This small but critical sealing component prevents coolant leaks at the pipe-to-head junction and is engineered specifically for BMW's B46D, B58C, and B58D engine families.

A worn or damaged coolant pipe O-ring can result in coolant seepage, overheating, and long-term engine damage. Replacing this seal at the first sign of a leak—or proactively during water pump, thermostat, or cooling system service—is the best way to maintain a properly sealed cooling system.

Key Features:

• Genuine BMW OEM part — manufactured to exact factory specifications
• Seals the coolant water pipe to the cylinder head
• Compatible with BMW B46D, B58C, and B58D engine applications
• Direct OEM replacement — no modification required
• Backed by BMW's standard 2-year warranty on genuine parts

This O-ring is commonly replaced during cooling system maintenance, water pump service, or any time the coolant pipe is disturbed. Always install a new O-ring when reassembling coolant pipe connections to ensure a leak-free seal.