Outfit your semi to be Ready for the Road Ahead with a seamless coupling of the service and supply air lines, with the Cynvalve Emergency 3/8" NPT Shut-Off Glad Hand. With an interlocking design, this replacement coupling is able to quickly disconnect air lines, without any need for advanced skills or specialized tools. Manufactured with a durable design to withstand extreme air pressure. FleetPride is your First Click in Heavy Duty .