Fitting example:
Slip the screw cap (1) and the silicone seal (VQM) (2) with the PTFE sleeve over the object (thermometer, tube etc.) to be passed through. The PTFE face has to point to the reaction chamber.
Place the screw cap (1) over the silicone seal (VMQ) with the PTFE sleeve and screw it tight on the threaded tube (3).