Two-part coupling made of PVDF for connecting elastic tubing (e.g. Viton®, Tygon®, silicone) to hard-walled tubing made of PTFE, glass or other plastics. Easy and ingenious functioning: the elastic tubing is pushed on a cone and fixed on the coupling by means of a connecting nut. On the other side, the hard-walled tubing is connected as follows: Hard-walled tubing up to a maximum O.D. of 10 mm is connected to a GL thread by means of laboratory screw joints. Restricted chemical resistance, working temperatures up to max. +170°C. For tubing I.D. mm 6,4, For tubing O.D. mm 9,8, Bore dia. mm 6,4, Thread of screw cap GL 18