This type of couplers are used to splice bars with different diameters. They are also called as Transition Couplers. The reducer coupler is rotated onto the bar with higher diameter and then the bar with lower diameter is rotated from other end for joining. Reducer couplers can have parallel threading as well as tapered threads.
Cost saving – Lesser steel consumption
Higher UTS than that of parent rebar
Shortens project timeline
No torque wrench required
Solves bar congestion
Improvement in concrete flow
Some error has occured.