Pipe reducer

Reducer is a kind of fitting that be used for reducing piping size. There are 2 types reducer as follows:
a. Concentric reducer: have a central axis (centerline) of the section between the large and small.
b. Eccentric reducer: the central axis has a different (offset) between a large section and small.
Concentric reducer is most commonly used and often eccentric reducer used in piping in about pump and piperack area.

Pattern	Weld	Seamless
Nominal size	1/2”-48” (DN15-DN1200)	1/2”-20” (DN15-DN500)
Wall thickness	2~1600mm	2~50mm
Type	Concentric/eccentric	Concentric/eccentric

Reducers
carbon concentric	carbon eccentric	concentric reducer	eccentric reducer

Check more details: http://www.steelfittings-flange.com/html_products/concentric-reducer-56.html