Do you know what quick exhaust valves are? They are special fittings used in the different sectors of the industry for the purpose of increasing the cycle speed of a cylinder. The retraction and extension of the quick exhaust valve depends upon the actuation requirements of the system.
Are you aware of what pneumatic fittings are? These are special parts which are used to connect the sections of pipes, hoses and tubes, in specific pressurized pneumatic or gas systems.
What makes pneumatic fittings different from that of hydraulic options, is that they have tighter seals and only have low pressure requirements. They are also specifically used in logic control systems, along with instrumentation.