Cowie Extension & Reducing Adapter, PTFE, for High Vacuum Seals of Glass Joints, 280℃With ASTM & DIN Joint-type, NO-Grease, NO-Breakage, NO-Leak, PTFE 조인트 확대 / 축소 어댑터, 글라스 Joint 진공용 (DH24CAT00001642)