Replacement vapor (steam) tube adapter for Bchi R-200/205 rotary evaporators. Adapters have a 50mm OD top flange with a tapered interior to fit the Bchi sealing ring. Lower portion of the adapter has the listed standard taper inner joint. Each tube is supplied complete with corresponding size Keck clip.NOTE: ITEMS WILL REPLACE THE BUCHI PART NUMBERS AS LISTED. CHEMGLASS ITEMS ARE TO BE USED WITH THE KECK CLIP, NOT THE BUCHI COMBI-CLIP.