It is a plumbing component used in the installation of balanced flue boilers. It is a curved pipe that is designed to redirect the flue gases from the boiler at a 45- Deg ree angle. This type of elbow is commonly used to connect the boiler to the flue pipe, which then vents the combustion gases to the outside of the building.

This elbow is commonly used to connect boilers to balanced flue systems, which utilize both an air intake and exhaust flue to promote efficient combustion and prevent the buildup of harmful gases.

It can be used to change the direction of the flue pipe, allowing for more flexibility in boiler installation and accommodating specific building layouts.

By providing a smooth and efficient path for flue gases, this elbow contributes to the overall efficiency of the boiler and the flue system.