A no-hub reducing coupling may be used in the _______________ position?

A no-hub reducing coupling is designed to connect different diameters of pipes without being affected by the positioning of the pipes in terms of vertical or horizontal alignment. However, its primary application is in horizontal installations. This is because horizontal runs are more common in drainage systems, and the design of the no-hub coupling provides a reliable and strong connection that can withstand the pressure and weight of the wastewater flow.

In practical applications, the horizontal use helps to minimize the risk of stress on the coupling from the weight of the pipe and the contents being transported. Correctly installed, it ensures that the connection remains watertight and secure. The coupling's features, including its flexible design, are primarily engineered to accommodate horizontal connections effectively, supporting efficient flow and minimizing the potential for leaks.

While these couplings can technically be used in other orientations, the most suitable and preferred application is in horizontal installations, making it the most appropriate choice.