Equip your semi to be Ready for the Road Ahead™, with the Phillips Service 3/8" Shut-Off Glad Hand, a crucial element that provides a seamless coupling of the service and supply air lines. 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®.