A dispenser part, includes a first injection moulded plastic component part with an associated first mating surface along a first edge； a second injection moulded plastic component part having an associated second mating surface； a seam formed by the first mating surface and the second mating surface during injection moulding for joining the first component part and the second component part to define a dispenser part. A transverse cross section of the seam includes at least one step and at least one contact surface intermediate an inner and an outer surface of the dispenser part.
