What does a pipe reducer do?

A pipe reducer is a fitting that is designed to connect two sections of pipe with different diameters. Specifically, option C accurately describes the function of a pipe reducer, particularly when it relates to galvanized pipes. The reducer enables the transition from a larger diameter pipe to a smaller diameter pipe, often featuring threads on the inside to facilitate a secure connection.

Pipe reducers are essential in plumbing and piping systems where it is necessary to control flow rates, manage pressure, or adapt to existing piping that may have been installed at different sizes. By allowing the installation of a smaller diameter pipe, the reducer helps optimize fluid dynamics and maintain system efficiency.

The other options do not align with the function of a pipe reducer. While some fittings might increase pipe size or join pipes at angles, these tasks are not within the scope of a reducer. Additionally, stopping or wasting water is unrelated to the primary function of a pipe reducer, which focuses solely on size reduction for connection purposes.