Quick coupler male for air conditioners R134a

1. Properly clean the A/C system mating surface that will get in contact with the coupler to avoid any dirt or residues from contaminating the system
2. Connect the quick coupler to the A/C system:
- Turn the knob anticlockwise, then pull back the sleeve of the female coupler
- Connect the female coupler to the male coupler of the system, then release the sleeve
3. Turn the knob clockwise to open the internal valve
4. Refill the vehicle A/C system
5. Disconnect the quick coupler:
- Turn the knob anticlockwise to close the internal valve
- Pull back the sleeve and disconnect the female coupler from the system