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![PRG-345 Valve, High Vacuum, "S" Type](http://www.prismresearchglass.com/magento/media/catalog/product/cache/1/thumbnail/50x/5e06319eda06f020e43594a9c230972d/p/r/prg-345.jpg "PRG-345 Valve, High Vacuum, "S" Type")
![PRG-360 Valve, High Vacuum, "T" Type](http://www.prismresearchglass.com/magento/media/catalog/product/cache/1/thumbnail/50x/5e06319eda06f020e43594a9c230972d/p/r/prg-360.jpg "PRG-360 Valve, High Vacuum, "T" Type")