Scotchlok (TM) ; IDC Butt Connector UY2 Box The small size of the UY2/UY2-D solvent resistant connectors reduces the splicing bundle O.D. to a minimum. Their two ports accept two solid copper conductors that can be of different wire gauges. Full Description » The connector is filled with a sealant to provide moisture resistance. In addition, the UY2 connector is available in a dry version, UY2-D connector.