1Made of 100% brand new and high quality, durable for long time use 2Quick release action allows to quickly change airbrushes when you use multiple airbrushes with a single air supply hose. Mounts inline between the Airbrush and Air hose 31/8 Male on one end and 1/8" Female fitting on the other end. This coupling also swivels, helping to eliminate hose kinks 4Automatically shuts off air flow from the hose when disconnected 5Easy to use, simply pull back the spring loaded sleeve and the fitting separates into two pieces