| 1. | Stopcocks used in laboratory glassware are typically forms of conically tapered plug valves.
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| 2. | Vault makers subsequently redesigned their doors so they closed with a thick, smooth, tapered plug.
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| 3. | The shop-made mandrel shown in the photo is designed to clamp a hollow tube or gear between the two tapered plugs.
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| 4. | Prctical ramjets don't have to have a narrowing of the tube-they can have an co-axial tapered plug, as shown in many drawings.
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| 5. | It consists of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem.
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