DURAN-glass Screw Adapter, with GL-Screw & Joint, Ideal for Holding Stirrer Guide·Thermometer·Tube·Rod Holder &c.Used with Opentop Screwcaps·O-Ring Seal·Injection Septa & Closetop Caps, 스크류 어댑터, 교반씰·온도계·봉·관의 홀딩 및 마개용 (SL21CAT00000029)