Concentric Reducer which is also known as a conical reducer, the center of both the ends is on the same axis. It maintains the centerline elevation of the pipeline. When the center lines of the larger pipe and smaller pipe are to be maintained same, then concentric reducers are used.

Swage Reducer is like reducers but small in size and used to connect pipes to smaller screwed or socket welded pipes. Like reducers, they are also available in concentric & eccentric type. Swages are available in different end types. Such as both plain ends or one plain and one threaded end.