Final answer:
Couplings usually connect pipes of the same size to ensure seamless fluid flow, although special types can connect different sizes.
Step-by-step explanation:
The statement "Couplings connect pipe of the SAME size." is generally true. In the field of engineering, especially in plumbing and piping, couplings are fittings that are used to connect two pipes of identical diameter. They provide a continuous flow path for the fluid within the pipes. While there are special types of couplings called reducing couplings or transition couplings that can connect pipes of different sizes, standard couplings are designed to join pipes of the same size to ensure a smooth and leak-free connection.
For example, if you have a large diameter pipe and need to connect it to a smaller diameter pipe, you would use a coupling adapter to achieve the connection. The coupling adapter has different-sized openings on each end, allowing for the connection between the two pipes. Couplings play a crucial role in ensuring seamless connections and proper flow of fluids in various applications.