Glass purge adapters for use with popular brands of rotary evaporators. Top has 35/25 socket joint for joining with the trap or condenser. The bottom has a 35/25 ball joint for connecting to the receiver flask. The middle or purge tube has either a 2mm PTFE stopcock or a 2mm valve to allow for purging or adding a purge gas into the flask assembly. Overall length is 75mm.