Which component is used to join sections and permit disassembly for valve servicing?

• A. Unions
• B. Mainline
• C. Drain valves
• D. Sleeving

Answer: (A)

Unions are the fittings designed to connect pipe sections in a way that can be taken apart easily for valve maintenance. They consist of two end pieces and a central nut that, when loosened, lets the two ends separate without cutting or unscrewing the pipes. A gasket or seal provides a leak-proof join when the union is tightened again, making it ideal for servicing valves or removing components without disturbing the rest of the line. The mainline is simply the primary piping network, not a joiner that facilitates disassembly. Drain valves are for releasing water from the system and do not function to connect sections. Sleeving is a repair approach for damaged sections and isn’t inherently about enabling quick disassembly for servicing.