Aerator 11005198 Hahn hose with ball joint and water-saving lamps with reduction M22 x M24, chromed (tool)
Fits Grohe Concetto single lever kitchen mixer, DN 15, 32663 001 (wall-mounted fitting with single-hand operation, AFAIK the only one there), if the outlet is too high. Well, the ball head, so you can direct the beam to the rear.