Rotary joints for rotovap - what do they look like?

I've been looking at some of the pictures of rotovap's and through some of the sites that sell parts for them and it is a little confusing as to what the joint looks like that spins. I'm guessing it is glass on glass or do they also make PTFE joints?

I have seen the ball and socket joints which would seem like they would work well for rotation.



But on this page the flasks and items with this joint are labeled "reveiver" flasks which are the collection flasks, which seems odd IMO.

https://www.laboratory-equipment.com/lyophilizers-evaporatio...

Are there any special joints that are used specifically for rotovaps or a specific taper?

they don't use glass on glass for the rotating part i think, i've never seen a dismantled rotovap but searching on the web i found they they use a mechanical rotating seal



maybe you could use the joint used for mechanical stirrers to do a similar job

Quote: Originally posted by RogueRose

I've been looking at some of the pictures of rotovap's and through some of the sites that sell parts for them and it is a little confusing as to what the joint looks like that spins. I'm guessing it is glass on glass or do they also make PTFE joints? I have seen the ball and socket joints which would seem like they would work well for rotation.

They do use special joints frequently but they also use those glass ball and socket joints for all glass sytems.
See the pic below. C is the ball and socket rotating joint.



Sorry I can not find the document I clipped the above crappy pic from. If you search for "all glass rotavap" you will probably find it or something similar.