Connecting tubes which have been cut to size can be connected to one another using ITAS tube connectors made of cast aluminium via a simple plug-in principle. No further mechanical processing is necessary, which reduces assembly costs to a minimum. An internal clamping mechanism and the tightening of the special clamping screws guarantee a positive connection with smooth transitions, which are pleasant to the touch and also ensure enhanced safety – injuries due to getting caught up are an impossibility. The result is a simple and stable system which fulfils all safety guidelines.