A clamp assembly including a curved resilient band terminating in a radial direction in two clamp members and in an axial direction in two end faces that are bent radially inwards, the resilient band being adapted to receive therein an elastomeric seal that contacts an outer contour of a pipe, wherein the end faces are formed with a plurality of notches, each of the notches having an open end facing radially inwards and a closed end opposite to the open end, the closed end being wider than the open end.