Rebar couplers replace standard rebar lap joints in reinforced-concrete structures. They are also suitable for reinforced-concrete columns and walls. Each rebar coupler consists of a piece of rebar with a threaded end and a coupler sleeve installed on the right side during installation.
Rebar couplers can replace all rebar passing through formwork at construction joints. Historically, lap splicing has been the primary method of load transfer between reinforcement bars.