So on this are the shanks just slid into holes in the pvc or are they secured somehow?
Not secured, though they fit pretty snug. The duct is easily removable. To do so I just back-off the shank nuts nearly all the way and push the shanks forward (extending them out of the coffin) which allows them to "leave" the duct. Then the duct can be lifted out of the female bases and laid down. All the while the beer lines are sliding out the holes (still attached to the shanks) allowing me to change a line, etc.