Teflon* TFE stoppers with threaded polypropylene extracting nut. Stoppers for boiling and distilling flasks are ideal for flasks with ground joints. Stoppers for separatory funnels and volumetric flasks are interchangeable with pennyhead stoppers.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.