What type of sleeve connects two pipes with internal threads at both ends?

Prepare for the Master Mechanical License Test with flashcards and multiple-choice questions. Each question includes hints and detailed explanations. Get confident for your exam!

A coupling is specifically designed to connect two pipes that have internal threads at both ends. This fitting allows for a secure connection to be made between the two pipes, accommodating the threaded ends for a tight seal. Couplings are essential in plumbing and piping applications as they enable the extension of pipe runs when needed or the repair of broken pipes without needing to replace entire sections.

In contrast, a union is a fitting that connects two pipes but usually allows for easy disassembly, making it different from a coupling, which provides a more permanent connection. A cap is designed to seal the end of a pipe, preventing flow, while an elbow is used to change the direction of pipe flow, typically at a 90 or 45-degree angle. Therefore, while other fittings serve important functions, they do not connect two threaded pipes in the manner that a coupling does.

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