Extra plug for the Sure Eject automatic AC disconnect system. These connectors are designed for use with 3-wire cord with a diameter from .300" to .655" (18/3 SJ through 12/3 S). Check to see that the amperage rating on the connector is correct for the installation. If the cord is 14/3 or 12/3 S, knock out the cord clamp insert from inside the housing. Cords larger than .500" (14/3 S or 12/3 S) will not fit through the housing unless the cord clamp insert is removed. See installation instructions under resources for more information.