What do you call a short pipe whose threads at both ends meet in a plumbing system?

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In plumbing terminology, a short pipe with threads on both ends that meets the requirements set forth in the question is known as a close nipple. A close nipple is specifically designed to join two female threaded pipes or fixtures, allowing for a very short, direct connection. The term 'nipple' in plumbing refers to a small length of pipe that has external threads on both ends, allowing it to secure connections between various fittings or fixtures.

This feature of having threads on both ends is what differentiates a close nipple from other fittings. A coupling serves a different purpose as it is typically a longer fitting that connects two pipes but does not specifically have the same short length or threaded nature as a close nipple. An elbow is a fitting used to change the direction of the piping, while an adapter is utilized to connect pipes of different sizes or types, neither of which represents the characteristic function of a close nipple.

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