A union is a three-piece plumbing fitting that connects two sections of pipe, allowing for easy disassembly without disturbing the entire piping system. It consists of two threaded ends and a central nut that tightens to create a leak-proof joint. Unions are commonly used in water supply lines, gas lines, and other plumbing applications where periodic maintenance, repairs, or replacements are needed. They are made from materials like brass, steel, or PVC, depending on the system requirements. Proper installation of unions ensures secure, accessible connections, making it easier to maintain or modify the system.
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