Pneumatic tube fittings are a type of connector used in pneumatic systems, which are systems that use compressed air to operate machinery and equipment. Pneumatic tube fittings are designed to connect tubes or hoses and provide a secure and leak-free connection.There are various types of pneumatic tube fittings available, including push-in fittings, compression fittings, barb fittings, and quick connect fittings. Push-in fittings are easy to install and remove, while compression fittings require tightening with a wrench. Barb fittings have ridges on the fitting to grip the tubing securely, while quick connect fittings have a push-button mechanism that allows for quick and easy connections.Pneumatic tube fittings are made of materials such as brass, stainless steel, and plastic, depending on the specific application and environment. They come in various sizes and shapes to accommodate different tubing diameters and angles.