A Concentric Reducer joins the tube sections on the same axis. They connect unequal size pipes that have a common centerline and are used for TC transitions in vertical tubing.

Hence, it is a fitting with different size ends to mate hose or tubing of different diameter that joins tube sections on the same axis. Since virtually all piping systems go through changes in diameter either in the run or at the equipment connections, a reducer serves the dual purpose of changing the piping diameter and at the same time that of handling the expansion, misalignment or vibration problem.

While there are published transition sizes and face to face dimensions, it is seldom that the cataloged sizes are what is needed on the jobsite. Hence, the face to face dimensions as well as the two flange sizes are varied to fit the application. Thus, Custom reducers are easily manufactured as per the specifications.

If one works with a straight connector, it means that in addition to the expansion joint, an expensive cast iron or steel reducer must be used for the piping transition. This would result in a need for additional space and add to the cost as well. So, there are two options available, of concentric reducer or eccentric reducer. Reducers, both concentric and eccentric, are offered mainly from ½" to 12"

In general, concentric reducers are more commonly used than the eccentric reducers.

Concentric reducers are built with the small and large diameters on opposite ends, joined by a cone shaped transition section.

These hose reducers are available in various materials like steel (various grades), alloys, plastics etc.