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Tapered lab plug set includes 10 solid rubber stoppers, size 5 pound sign, bottom diameter 22 mm, top diameter 29 mm, height 28 mm, ideal for flasks and bottles Reliable sealing performance for test tubes, flasks, bottles and other laboratory containers thanks to the tapered conical shape that fits a range of openings Please check the dimension picture carefully before ordering, as a measurement variance of about 1 mm is possible between individual stoppers Excellent resilience and elasticity, maintaining suppleness and a firm seal over long periods of storage or repeated laboratory use Please note these white rubber stoppers are intended for laboratory sealing applications and are not suitable for food contact use