Pneumatic function fittings are connectors that add additional control and safety to Pneumatic systems. These connectors do a lot more than just connect, tubes, hoses to a valve, cylinder, or air-powered system. These function fittings come in a variety of sizes and materials Types of fittings Flow control Regulators- Control the speed of the flowSensor Fittings – Detect  any Pressure drop Venting Protection – Block the supply of and vent the system pressureNon Return Valves – Let air pass in one direction blocking it from flowing in the opposite directionSpeed Controllers – control the flow of compressed air to pneumatic actuators