change for example the material properties and or the throughflow characteristics of the jet regulator when required the plastic lining 4 here is of cup shaped design specifically in such a manner that the plastic lining 4 by means of a raised circumferential wall 16 of the cup shape thereof provides a seal between the outer circumference of the outlet disk 3 and the housing inner circumference of the jet regulator housing 2 the outlet disk 3 and the plastic lining 4 have throughflow openings 5 7 which merge into each other and in each case form a perforated grate and or mesh structure and here a perforated structure it can be seen in fig4 that the outlet disk 3 is held pivotably together with the plastic lining 4 which is provided thereon in the jet regulator housing 2 the outlet disk 3 and also the plastic lining 4 here together form a pivoting disk which is in the shape of a spherical segment on the outer circumference thereof and is mounted pivotably in a partial region which is configured as a joint socket 6 on the housing inner circumference of the jet regulator housing 2 it can be seen in fig1 8 and 10 that the outlet disk 3 and the plastic lining 4 held thereon are insertable into the housing interior of the jet regulator housing 2 through an inflow side insertion opening in the jet regulator housing 2 as far as the partial region configured as a joint socket 6 it can also be seen in fig1 8 and 10 that the throughflow openings 5 7 of the outlet disk 3 and of the.