The 192990-1390 is a reversed plug from the Trident Ringlock series, designed for establishing a 7-contact circular connection. It features a shell size of 18 with a maximum diameter of 34.30 mm and is configured to accept socket contacts. The connector provides a 1-1/16 - 18 UNEF accessory thread for backshells and other accessories. Key features include the option for discriminating (keying) pins to prevent mismating, and the ability to be water-sealed to an IP65 rating, making it suitable for industrial applications requiring a robust and reliable connection.