Equip your semi to be Ready for the Road Ahead , with the Phillips Emergency 3/8" Shut-Off Glad Hand, a crucial element that provides a seamless coupling of the service and supply air lines. This replacement coupling allows for a fast and easy disconnection from air lines, without any need for specialized tools or advanced skills. Engineered with a durable design to tolerate extreme air pressure. FleetPride is your First Click in Heavy Duty .