I was stuck as well this thing is like a Chinese puzzle box

Here you go!

First there are three parts to the connector 1st-Black Collar 2nd-Metal Collar 3rd-The Body of the connector

It is best to have a friend there to help because this really should be done with at least 3 hands

Step 1 Push the Body “left” (Tight to the strainer) HOLD IN PLACE WITH PRESSURE

Step 2 Push the metal collar “Right” (Close the gap between the body and metal collar)

Step 3 Now while continuing to hold the body tight to the strainer and the metal collar tight to the body (Do this with one hand) use a small flathead screwdriver to push the black collar “right” (up under the metal collar) HOLD IN PLACE -

NOTE: if it takes more then a small amount of pressure to push the black collar up under the metal collar you failed in step 1 or 2

Step 4 have a friend then pull the strainer “Left” out of the connector or if your alone hole the black collar under the metal collar and the metal collar tight to the body and pull “right” sliding the whole thing off the neck of the strainer

See Photo Below