The HUBBELL part HBL2513 is a locking connector designed for commercial and industrial applications. It is a durable and reliable connector that can handle a maximum current of 20 amps and a voltage of 120/208 volts. The connector has a L21-20R configuration, meaning it is a receptacle that can receive a locking plug with a L21-20P configuration. The connector is black and white in color, making it easy to identify and connect. With its sturdy construction and secure locking mechanism, the HBL2513 is a perfect choice for demanding electrical connections.