GammaFunction
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Identify this piece of glass?
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.
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tramanazi
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never seen anything like that. Doesnt seem like its for vacuum though, nitrogen?
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Dr.Bob
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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.
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GammaFunction
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Thanks. If it were intact, I suppose it could used as a small desiccator.
I need to get over my aversion to discarding things, and throw it out.
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sbbspartan
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I hate to sound like a hoarder, but I wouldn't throw it out. Maybe put it up for auction on eBay to see if anyone wants it, or keep it yourself.
You never know when it might come in useful... 
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Vargouille
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The 19/38 gas adaptor *could* be useful. I would have to think about snatching it up if only my glass wasn't 24/40.
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