PYREX® Polyethylene Stoppers, Standard Taper
Blue and white PYREX® polyethylene lab stoppers are made from linear high-density polyethylene and have closed bottoms to conform to Standard Taper stopper dimensions. The three rings on the plug provide an efficient seal. This improved design fully protects the neck in the event of accidental tipping. These plastic stoppers may be used in place of the conventional glass Standard Taper flask stoppers.