When a male half quick disconnect and female half quick disconnect are connected together, it forms what is called a quick disconnect coupling assembly. The male half and the female half each contain a spring loaded poppet valve. When the male half and female half are connected, the poppet valve opens allowing fluid or gas to flow in either direction. When the male half and female half are disconnected from each other each poppet valve closes. Instantly stopping flow in both directions thus preventing fluid loss and air inclusion into the system. Venting, bleeding, and replacement of fluid or gas lines can be expensive and time consuming. Using a quick disconnect coupling assembly is the best way to improve the speed and efficiency when working with a hose assembly in gas or fluid system. Quick disconnects take the place of traditional fittings when fast maintenance, quick repairs, and easy replacement of are a necessity. The main benefit of using self sealing quick disconnects is the user can speed up inspection, maintenance time andor replacement time without having to vent the system to the atmosphere.