Thor quick-connect air couplings are used with air or water hoses requiring heavier duty, more durable couplings. Also known as double-locks or nationals, these couplings use a quarter-turn and click connection to secure. A spring-retracting sleeve prevents unintentional disconnection. They are compatible with any of the double-lock sockets regardless of barbed hose ID or pipe size. These multipurpose couplings connect air tools and hoses to compressed air supplies for drop-down air lines, construction vehicles, and automotive service and repair.