Screw caps with free movable insert made of PTFE. Depending on the version, for connecting capillaries (O.D. 1.6/2.2/3.2 mm) and hose olives for tubing with I.D. 5.5 to 8 mm. A b.safe exhaust air filter can be screwed into the thread GL 14 (not included in the scope of supply).
