Zip HydroTap - Read These Warnings First; Safety, Refrigerant, and Qualifications; Venting, Lifting, and Airflow; Filter Control

Step 7:
Slightly moisten the O-rings with regular tap water and line up the front cartridge label to the left.
Step 8:
Gently but firmly push the cartridge up into the filter head and turn a quarter-turn to the right – as far as it will go
without forcing it. The cartridge should now be locked in position with the front label facing forward.