This Genuine Heavy Duty 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
Twistlok feature prevents accidental disconnection
When coupled, the adaptor can swivel, thereby eliminating hose kinks
Nominal bore: 8.5mm
Flow rate @ 6 bar (0.5bar p.d.): 500 l/min
Maximum working pressure:  17 bar / 250 psi
Temperature range: -20°C to 80°C
Interchange with CEJN 499, RECTUS 68