- Clean the container.
- Clean the filter.
- Lubricate the container.
- Lubricate the o-ring.
Blow debris out of the inner surface of the filter head .
Find the surface  where the o-ring on the installed container will touch the filter head.
Fully clean this area.
Use a towel that is soft and clean.
Apply a thin layer of silicone grease  to the clean surface.
Fully clean the o-ring groove .
Examine the o-ring.
If the o-ring is cracked or broken , replace it.
Apply a thin layer of silicone grease to these areas:
- the o-ring 
- the o-ring groove 
- the threads  on the filter container
Put the o-ring into the o-ring groove.
Make sure the o-ring is installed tightly in position.
Align the filter container with the filter head .
Carefully turn the filter container with your hand into the head.
Turn the container until it is tight.
Loosen the container 1/4 of a turn.
Monitor the filter head for leaks.
If the filter has leaks, do steps 1-4 again.