Get your semi truck Ready for the Road Ahead with a seamless transfer of fluids and gases, with the X-tra Seal 1/4" NPT Female Type D Brass Air Coupler. Due to simplistic design, this replacement component allows operators to quickly connect / disconnect hydraulic hoses to applications that require frequent use. Engineered with an ultra-tight seal to prevent leaks and accidental disconnections. FleetPride is your First Click in Heavy Duty .