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Chemglass, CG-511-20, 12mm PTFE Stem Only, Viton O-Rings
Replacement 12mm and 20mm Chem-Cap stem and control knob for Chemglass cylindrical and spherical vessels. PTFE stem is sold complete with Perfluoro or Viton o-rings installed under each Chem-Cap and one installed as the back up o-ring.
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