Draper 14 bsp taper female thread vertex air coupling draper 51406 for use with standard adaptors bsp taper double action mechanism prevents accidental disconnection and makes the coupling particularly suitable for trailing hose applications maximum airflow rate 1197lmin 42cfm at 69bar 100psi maximum working pressure 138bar 200psi sold loose draper 51406 12 bsp taper female thread vertex air coupling