Replacement borosilicate glass for Buchi® R220, R220EX, and R220SE rotary evaporators. Receiving flasks are designed to fit all large-scale rotary evaporators. Comes in amber version. Side necks include 7647-40 SVL-22 threaded black vent caps. Top and bottom socket joints are DN25, and bottom joint includes 7855-840 CAPFE (PTFE-encapsulated silicone rubber) o-ring, size -217.