The POWERTEC 70113 4-Inch Dust Collection Coupling is a black plastic accessory designed for 4" outer diameter dust collection systems. This coupling, measuring 5 x 5 x 3.4 inches and weighing 4.16 ounces, is from the Powertec brand and is not discontinued. It allows for easy connection and efficient dust collection in various home and workshop applications, making it an essential addition to your power tool and air tool accessories.