Which fitting is used when connecting sections of pipe with the intent to change direction and return?

The fitting used when connecting sections of pipe with the intent to change direction and return is the return bend. This fitting is specifically designed to redirect pipe flow by turning it back to its original direction, effectively creating a loop. It is commonly utilized in various plumbing and HVAC systems where a complete change of direction is needed while maintaining a continuous flow.

Return bends are essential in systems where space constraints or specific configurations require the fluid or gas to double back on itself. They are different from other fittings like elbows, which typically change direction without the intent of a return. This unique functionality makes return bends particularly valuable in applications such as laboratory setups, heating systems, or any installation where precise control of flow direction is necessary.

Understanding the specific use of return bends highlights their importance in project design and installation, ensuring that systems function efficiently and as intended.