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Strictly Necessary
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These CorningPYREX® pear-shaped Squibb glass separatory funnels have PTFE (Polytetrafluorethylene) Product Standard stopcocks and Standard Taper polyethylene stoppers. The stopper is made with a closed bottom and is of linear high density polyethylene to conform to Standard Taper stopper dimensions. The PTFE plug fits into the micro-finish barrel. The plug also reduces freezing problems and grease contamination.