Blue, PP screw cap with GLS80 thread and PTFE body. Centre neck with GL25 thread for connecting tubing up to 15mm o.d., four lateral necks with GL18 thread. Exchangeable shaft guide (PTFE) with PPS screw cap included for inserting and fixing a stirrer shaft into the centre neck. Very good chemical resistance, for working temperatures up to max. +250°C (PP screw cap max. +140°C).