High-performance silicone coolant hose that connects the water pump and thermostat on N54/N55. HD replacement for BMW part #11537545665.
This is the coolant hose that connects the water pump and thermostat on N54 engines in the E82 135i/1M, E90/E92 335i, E60 535i, X6 35i (N54 only), and E89 Z4 35i. While not under a lot of stress this is often replaced as a "while you're in there" scenario or if the hose is damaged during turbo work.