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These PYREX® pear-shaped glass separatory funnels have PTFE (Polytetrafluorethylene) 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. For replacement polyethylene Standard Taper stoppers, see No. 7624; for PTFE stopcock assemblies, see No. 7681.
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