The diameter is 6mm for Mercedes-Benz Air Ride Compressor Air Line Hose -10 m

Condition:New|Adjustable:Yes|Brand:Unbranded|Country/Region of Manufacture:China|Custom Bundle:No|Fit for:for Mercedes Benz |Fitment Type:Direct Replacement|Gas Charged Shock:Yes|Included Hardware:Connector Fitting|Manufacturer Part Number:Does Not Apply|Modified Item:No|Type:Air Suspension Compressor Connector|Manufacturer Warranty:2 Year