The Hubbell HBL26W47 is a watertight locking plug designed for industrial use. It has a NEMA plug configuration of L5-20P, 2 poles, 3 wires, and a current rating of 20A. The plug is impact-resistant and made of thermoplastic elastomer. It is also chemical-resistant and watertight, making it suitable for use in harsh environments. The plug has screw terminals for wire connection and is polarized. It has a maximum cable diameter of 0.875 inches and a minimum cable diameter of 0.375 inches.