Which device is used to join two pipe sections and allow disassembly without cutting?

• A. Union
• B. Elbow
• C. Tee
• D. Coupling

Answer: (A)

When you need to connect two pipe sections in a way that you can take apart later without cutting, you use a union. A union is a special three-piece fitting that uses a nut and gasket to clamp the two pipe ends together. Tightening the nut seals the joint, and loosening it lets you separate the pipes for service or replacement without damaging the pipes or needing to cut.

Elbows and tees are fittings that change direction or create a branch in the piping, not for easy disassembly. A basic coupling is a sleeve that joins two pipes, but many couplings are intended to be permanent (glued, soldered, or press-fit). The union’s design specifically facilitates disassembly, which is why it’s the best choice here.