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A concentric reducer is used to join pipe sections or tube sections on the same axis. The concentric reducer is cone-shaped, and is used when there is a shift in diameter between pipes. For example, when a 1" pipe transitions into a 3/4" pipe and the top or bottom of the pipe doesn't need to remain level. This pipe reducer may be used when there is a single diameter change or multiple diameter changes. Unlike eccentric reducers, concentric reducers have a common center line. Concentric reducers are useful when cavitation is present.  Eccentricity occurs when the centerline is offset. 
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- Reducers used in Piping Industry: A short literature. (n.d.). Retrieved June 26, 2016, from http://www.whatispiping.com/reducers