Which type of fitting is typically used to make a straight pipe connection?

• A. 45-degree elbow
• B. PVC coupling
• C. Flanged fitting
• D. Reducing fitting

Answer: (B)

The choice of a PVC coupling as the correct answer is pertinent because a coupling is specifically designed to connect two pieces of pipe together in a straight line, allowing for continuity in a plumbing or piping system. Couplings are usually cylindrical and can be used with various types of piping materials, ensuring a tight seal that allows fluid to flow freely between the two connected sections of pipe without any angular deviation or loss of diameter.

In contrast, while 45-degree elbows, flanged fittings, and reducing fittings serve their own important purposes, they do not provide a straightforward connection. A 45-degree elbow is designed to change the direction of a pipe by a 45-degree angle. Flanged fittings, while allowing for connection and disconnection of pipes, usually require accompanying flanges and do not facilitate a direct and continuous connection like a coupling. Reducing fittings are used to connect pipes of different diameters, and that inherently means they do not maintain a straight connection between two identical-sized pipes.

Thus, when needing to establish a direct, linear connection between two segments of pipe, a coupling is the optimal choice.