An item usually metallic, threaded or unthreaded, used for securing to or positioning into a mating part. it is designed to be used in a globe, relief, regulator valve and the like as a means of controlling the flow of liquids or gases in a given system. one end may have an integral disk or be designed to accommodate a metallic or nonmetallic disk. the other end is designed for a handwheel, lever, spring, diaphragm and the like for nonpowered operation or to accommodate a gear, solenoid, air motor and the like for powered operation. the handwheel and/or disk may be furnished with the item. excludes stem, faucet; and stem, needle valve.