Mercedes-Benz Heater Hose - Feed Hose from Heater Control Valve to Engine | 2006-2011 Manufacturer:Genuine Mercedes Thread the hose stem into

Thread the hose stem into the hose ferrule

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The main reason why these units are failing is because of the introduction of ethanol into gasoline which degrades the rubber Diaphragm or membrane as its sometimes known

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Mercedes-Benz Heater Hose - Feed Hose from Heater Control Valve to Engine | 2006-2011 Manufacturer:Genuine Mercedes Thread the hose stem intoHeater Hose Feed Hose from Heater Control Valve to Engine for E350 (2006 2009), CLS550 (2007 2011), E550 (2007 2009)