Water sensor
There's a sensor on the bottom of the old filter.
Carefully remove this as it's plastic.
Pull it out.
As you can see there's a small rubber seal on it.
Remove this seal from the sensor.
Get the new filter out of the package.
On the bottom is a white plug.
Remove this from the filter.
On the thread of the cap is a new rubber seal.
Take it of, I used a flat screwdriver to help it a little.
Clean the water sensor and place the new rubber seal on it.
Put the water sensor back into the new filter.
Screw it on tight enough so it won;t leak.