Rubber Cork – Extra Soft, Size No. 11, One Hole, Superior Quality

This superior-quality rubber cork is made from extra soft, flexible rubber for a snug and secure fit in laboratory glassware. Designed with one precision-molded hole, it is ideal for inserting glass or plastic tubing in experimental setups. The cork fits tightly into flasks, test tubes, or bottles, making it suitable for gas collection, liquid transfer, or closed system experiments