General description This Draper 1/2' BSP Taper Female Thread Vertex Air Coupling is designed for use with standard adaptors and features a double action mechanism that prevents accidental disconnection. This makes it particularly suitable for trailing hose applications. Technical specifications Maximum airflow rate: 1197 L/min (42 cfm) at 6.9 bar (100 psi) Maximum working pressure: 13.8 bar (200 psi)