The present invention may be embodied as a device for selectively opening or closing an anesthetic reservoir, the device having a first component adaptable to a reservoir and a second component adaptable to a vaporizer. The first component may have a base, a nozzle, and a through-hole. The second component may have a support member with a knob for engaging the through-hole of the first component and preventing liquid from flowing from the through-hole. The first and second components may be threaded to engage with each other such that when the components are twisted relative to each other, the knob may move toward or away from the through-hole to prevent or allow liquid flow.本發明可被具體化為一種用於選擇性地開啟或者關閉一麻醉劑貯器的裝置，該裝置具有一可適於一貯器的第一組件以及一適於一汽化器的第二組件。該第一組件具有一基座、一噴嘴，以及一穿孔。該第二組件可具有一個具有一用於嚙合該第一組件的穿孔並且防止液體自該穿孔流出的凸起之支撐件。該第一以及第二組件可被刻有螺紋俾以互相嚙合，藉此當該等組件相對於彼此被扭轉時，該凸起可朝向或者遠離該穿孔移動俾以防止或容許液體流出。
