||Use Arlington's SNAP2IT line of duplex connectors for quick and easy installations. The snap-in design accepts many cable types, simply snap the cables into the fitting and attach to the box with a standard locknut. That is all there is to it. The fitting is zinc die-cast for strength and longevity, is cULus listed, and has an insulated throat to keep the conductor protected. Fits a 1/2" knockout, has a trade size of 3/8", and accommodates two cables ranging between 0.485"-0.612" each.