MANUFACTURING SOCKETS & RECEPTACLES IN THE USA! Tramec Sloan has been designing, manufacturing and assembling electric receptacles for over 25 years in our Iola, Kansas facility. From Single Pole to the revolutionary Smart Box to glass reinforced Nylon or Zinc materials Tramec Sloan has the options, OEM quality and value you're looking for. It's no wonder that we're chosen by the leaders in both the OE Trailer & harness manufacturing Industries. From under the hood, to the back of the trailer...We've got you covered!