This Genuine Schrader Coupling (manufactured by Parker Pneumatics) has been designed for single hand connection or disconnection and is generally suitable for most fixed compressed air applications.
 
Key Product Benefits and Specifications
Twist Lock feature prevents accidental disconnection
When coupled, the adaptor can swivel, thereby eliminating kinking of hose
Nominal bore: 5mm
Flow rate @ 6 bar (0.5bar p.d.): 900 l/min
Maximum working pressure:  17 bar / 250 psi
Temperature range: -20°C to 80°C
Interchangeable with: Cejn 399, Rectus 17