This ILSCO PBT-500 is a Nimbus Insulated Aluminum In-Line Splicer-Reducer Connector designed for both copper and aluminum conductors. It features a high dielectric strength plastisol that is resistant to chemicals and UV rays, and is cold temperature rated down to -45°C. This connector is dual-rated for reliable performance.The ILSCO PBT-500 is an in-line splicer-reducer connector with two ports. It is designed for use with aluminum and copper conductors ranging from 4 AWG to 500 MCM. The connector is tin plated, insulated, and rated for 600 Volts AC. It meets California Proposition 65 standards.