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The rubber bung may be used to seal a flask because the user may require the contents to be mixed via shaking the flask or may require that the contents be kept inside the flask and prevented from leaking out. In all cases, the bung keeps the experimentation environment sealed so that liquids or gases cannot escape (or enter). [citation needed]
They came in sets of four "torpedolike" [2] hard rubber [3] (later, plastic) instruments varying in diameter from 1 ⁄ 2 inch (12.7 mm) to 1 inch (25.4 mm) and in length from 3 to 4 inches (76.2 to 101.6 mm), [4] and according to a retrospective article in The American Journal of Gastroenterology, were no different from modern rectal dilators. [5]