A pipe flange aligner is typically used for when you are wanting to weld two different pieces of pipe together. The welder uses the pipe flange aligner tool to set them into place before the welding process begins. After setting the flange in between the two pipes, the aligner is used to pin the two flange holes together in a tight and snug fit. Some benefits of a pipe flange aligner include: The compact fit ensures that the welding process will be accurate. Threaded pipe flange aligners are going to have a fast release double lead threads. Can come with a 360 degree vial to make leveling the pipes easier for you. Saves you fit-up time by eliminating the irritation of adjusting a level.