By using this adapter, preliminary evaporation may be done on a rotary evaporator, then vessels can be transferred directly to freeze drying manifold

No need to transfer contents of flask. Joint is [ST] 24/40 with a 2 mm hole mid length for relieving the vacuum gently. The Ace-Thred connection is #25. For nylon bushing (with FETFE O-ring), see 89059-226. Fabricated from borosilicate glass.