PYREX® Hollow Combination Standard Taper Joint And Reagent Bottle Stoppers manufactured by Corning is closed at the bottom. They are interchangeable with standard taper joints and bottle stoppers of the same size. These lightweight stoppers are very strong to reduce chipping and breakage, thus minimizing replacement costs. A barrel-shaped head means it is easy to clean and even easier to rotate in or out. Grooves in the sides help prevent slippage. The flat top allows the stopper to stand on its head, which frees the user's hand and minimizes potential contamination.