KIMBLE Hollow Glass Pennyhead Stoppers, 19/22

Stoppers are used with laboratory glassware such as flasks, mixing cylinders and separatory funnels.

Sizes Standard Taper 10/18 through Standard Taper 19/22 are solid

Sizes Standard Taper 24/25 and larger are hollow

Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements