The head (1) has multiple longitudinal slots (6) formed on an outer sleeve (2), and a tubular inner part (3) whose ribs (8) are inserted into the outer sleeve and intervene taperingly in cross-section formed between the longitudinal slots and the ribs. The tubular inner part is connected with a front side of the outer sleeve and fixedly coupled with a suction tube (10) in a connecting area (7). The outer sleeve and/or the inner part are made of plastic, and the suction tube comprises a handle piece that is made of plastic.
