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What brand of machine is this?
Most hoses are either screwed onto the gun or permanently fixed to the gun.
I am sorry but I am not real familiar with this machine. However I believe that the only piece that comes off is the extension and it does push in and twist to lock it into place. Does this have a quick connect hose on it? Is it an electric or gas powered machine? The K3.000 is just a series number and not the model number.