The Cold Extrusion Rebar Coupler is easy to install and requires no special tools or equipment. It is ideal for projects that require a quick and efficient installation process, and it is compatible with various rebar sizes and types. Use with any 22-26 AWG solid core wire and slip them into the plastic splice so that they slide into the metal teeth. Then. When you want to connect a variety of metal components together without using heat, you can using what is called a "cold connection. ) Depending on the material you are working with, cold connections might prove to be the essential. Butt splices contain a small copper tube. Splices (including size transitions) can be made to smaller or larger conductors, provided both cables are within the Insulation O. They consist of an outer nut, a compression.