Originally Posted by ala_xfire

There is a catch on the backside of the tube that hits a protrusion on the valve cover.
I put a large screwdriver in there and lift up on the tube catch while twisting counterclockwise.
( I used a small Sears strap wrench on the tube ).
( I also used black touch up paint to cover the boo boo caused by the screwdriver - my covers are black crinkle )