Question 22

The Correct Answer is C **Explanation of Option C (Union):** A **union** is a type of fitting specifically designed to connect two lengths of pipe that are already fixed in place (i.e., cannot be turned). It consists of three parts: two ends that are attached to the respective pipes (either threaded or soldered), and a central ring or nut that draws the two ends tightly together to create a leak-proof seal. This design allows the pipes to be connected or disconnected easily without disturbing the piping on either side. **Why Options A, B, and D are Incorrect:** * **A) Nipple:** A nipple is a short piece of pipe, typically threaded on both ends. It is used to extend a line or connect two other fittings (like a valve and a coupling), but it requires the adjoining pieces to be turned for installation, making it unsuitable for connecting two fixed lengths of pipe. * **B) Coupling:** A **coupling** is a fitting used to connect two pieces of pipe permanently, typically by screwing them together. Like the nipple, installing a standard coupling requires turning at least one of the pipes, which is impossible if both lengths are already set in place. * **D) Tee:** A **tee** is a T-shaped fitting used to connect three sections of pipe, allowing a pipeline to branch off at a 90-degree angle. It is a directional component and not designed for the simple connection of two opposing, fixed lines.