The SynthwareTM High Vacuum Oblique Glass Stopcock manufactured by Kemtech America Inc. features precision ground barrel and plug with corresponding numbers. Lower vacuum chamber is evacuated through a 2 mm hole in the plug which is not in the line of flow.
Specification
Bore size: 4 mm Packaging: Pack of 1 ea
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SynthwareTM High Vacuum 90 Degree Stopcock With Hollow Plug, Bore Size 4 mm, Plug Size 17.35/50, Kemtech America Inc. (CAT#: STEM-L-2340-LC)