Gas-cooled MHG Water cooled MHW With remote control Range of aplication and connections Connection types of welding torch cable assemblies Z connection: Is used for gas-cooled welding torches as well as water-cooled welding torch cable assemblies of the older generation. SZ connection: Current connection for water-cooled welding torches. It distinguishes from the Z-connection in the external hoses for cooling liquid. EURO connection: Standard connection for universal application.