For Standard version tank:
- Unscrew and remove the top cap;
- Pull down the airflow control ring (see highlighted part in below picture), the used coil will automatically pop up. Push in a new coil in place;
- Screw the top cap back.
For Child-proof version tank:
- Press and unscrew to remove the top cap;
- Pull down the airflow control ring (highlighted part in below picture), the used coil will automatically pop up. Push in a new coil in place;
- Press and screw the top cap back.
Note: The pressing and twisting operations in each step are performed simultaneously.
