To use the Clip-On Elbow you simply place the tubing into the molded slot where you want to make a 90 deg. turn. You can just lay in on the ground, hang it in the air or nail it to something. The tubing will hold in the Clip-On Elbow if it is loose or nailed up.
Microtube is a great product and used in many areas but one drawback has always been keeping it where you want it. Making sharp turns would mean you use two 1/4" "C" Clamps with or without a barbed elbow. Labor saving little part here!