The invention relates to a connecting system for components through whichfluid flows formedicine and medical technology, in particular infusion or transfusion tubes,selector valves,multi-way distributors, injection equipment such as needles, accesses or thelike, andcombinations thereof, comprising a female tubular receptacle, which comprisesan innerreceiving section and an outer first fixing section, and/or a male tubularplug element forreception in the female receiving section and an outer second fixing section,whichcooperates with the first fixing section for fixing the connecting system. Theinvention ischaracterized in that the surfaces of the connecting system that come incontact with the fluidare produced at least in some sections from amorphous copolyester. Theinvention furtherrelates to the use of amorphous copolyester for producing a correspondingconnectingsystem.
