This item looks like it might be the top to some kind of desiccator or small reaction vessel. The male joint rotates to break the (presumed)
vacuum. The base is ground glass, so it fits against some missing second part.
Does anyone know what it is? Does anyone want it for a pittance, or a trade? I have two. I don't like to discard nice glass, but I'll never use it.tramanazi - 19-2-2013 at 04:20
never seen anything like that. Doesnt seem like its for vacuum though, nitrogen?Dr.Bob - 19-2-2013 at 06:30
Looks like a lyopholyzer jar lid. The top tube is about 1/2" diameter, I would guess, and that is the size of most freeze drier unit ports. You put
an aqueous solution in the jar, freeze the soln. solid, put the lid on it, and then connect the vacuum and close the vent by rotating. The vacuum
sublimes the water, continually removing heat from the sample, so that it stays frozen, until all of the water has been removed. That is what freeze
drying does. And that looks like part of the jar for it. I have a bunch of the larger jars (1L) and tops left, but donated most of the smaller ones
to a local college, where a friend works, as the market for those is small, and mostly at larger institutions. Without a matching bottom it is not
much use. GammaFunction - 19-2-2013 at 13:00
