Porcelanosa Noken NK 5 Function Diverter Cartridge (S904606418)This diverter cartridge has 5 function selectors and it is used on some of Porcelanosa and Noken (NK) shower towers, cabins and shower valves.Cartridge Measurements and InformationNumber of Diverter Openings: 5 (with one outlet in the middle making it 6)Total Length: 76mmm (7.6cm) (From the top of the toothed handle spline to the bottom of the locating pins at the bottom of the cartridge).Width at white body barrel: 50mm (5cm)Width of thread: 51.3mm (which is removable)Width of top spline with teeth (with the tap head carrier attached): 11.7mm 32 teeth (which the handle connects onto)Width of top spline with teeth (Without the tap head carrier attached): 7.5mm (with 18 teeth) (which the handle connects onto)Colour: Green, white, BrassMaterial: Plastic body. Metal connection thread.Other markings on the cartridge may include: - 'Project Service' - BrevettatoThis cartridge has ceramic discs inside which can crack over time. If you can't turn the cartridge and change function it's likely that the ceramic discs inside have cracked. There are no ways to fix this. The only solution is to replace the entire cartridge.