SciLab® Vacuum Stirrer-Guide, with DURAN® PBT Opentop Cap & PTFE/ Silicone O-Ring Seal and 24/- ~ 45/- Glass jointsFor Φ8~14mm Shafts, with Red PBT Screw Grip System, Chemically Inert, 200℃ Stable, 스크류 스터러 씰 (SL21CAT00003356)