Cowie® PTFE Extension / Reducing Adapter, 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 (SL21CAT00000022)