Prepare your semi to be Ready for the Road Ahead™, with the Phillips Emergency 3/8" Shut-Off Glad Hand that provides a seamless coupling of the service and supply air lines. Due to its interlocking design, this replacement coupling is able to quickly disconnect air lines, without needing any advanced skills or specialized tools. Constructed with a durable design to endure extreme air pressure. FleetPride is your First Click in Heavy Duty®.