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Rob,

My objection to Pyrex is that if you crash, it will likely break, with terrible results.

Heavy wall Pyrex in 5/16 dia would have a capillary size interior, and would be safer, but would have no flow. I have worked with lots of Pyrex.  Find something else.

David Jones

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.