What happens to the bit of copper pipe that is cut away inside when you rotate the self cutting tap ?
Our tests showed that most of the time a small section of the edge of the round piece stays attached to the copper pipe in a sort of hinge form. The cut away round disk then just hangs inside the pipe and the normal water passes right by with no trouble. If the small round cut section falls off, it invariably remains inside the pipe nearby due to its weight (if on a horizontal pipe) or falls to rest (on a vertical pipe).
