2001 - 2005 325i. Heavy Duty Durable Aluminum Thermostat with Housing and Gasket. 2001 - 2005 525i. 2001 - 2005 530i. Twice as efficient as factory pump. High quality water seal (Carbon Graphite). Replaces Part Numbers: 11517527799 / 11517509985 / 11537509227.
