Pneumatic fittings are parts used to connect sections of pipe, tube, and hose in pneumatic (pressurized gas) systems. Compared to hydraulic fittings, pneumatic fittings are typically characterized by tighter seals and lower pressure requirements.
Compared to hydraulic fittings, pneumatic fittings are typically identified by tighter seals and lower pressure specifications. They are generally used in pneumatic logic control systems and instrumentation.