General description Mercedes-Benz air conditioning service tool, designed for removing and refitting the receiver/dryer cartridge in the air conditioning condenser. This tool is essential for servicing or opening up the A/C system. Technical specifications Equivalent to OEM 203 589 001 000 Dimensions: 1/2" D x 27mm external hex x 65mm long Material: S45C steel with black phosphate finish Features a detent hole for a more secure fit on the wrench Compatibility and accessories Compatible with Mercedes-Benz models: W203 (2001 - 2007, C-class), W209 (2003 - 2009 CLK-class), and R171 (2005 - 2011 SLK-class) Usage The receiver dryer cartridge should be replaced every couple of years, especially when the A/C system has been opened or is about to be refilled