Noken (NK) 100039544, 100060452, 100060463, 1000604463 thermostatic cartridge which is used in the following Porcelanosa Noken shower mixer valves: - Porcelanosa Noken NK Neox Dual Concealed Shower Valve - Porcelanosa Noken NK Quatro Dual Concealed Shower Valve - Porcelanosa Noken NK Soft Dual Concealed Shower Valve - Porcelanosa Noken NK Basic Dual Concealed Shower Valve - Porcelanosa Noken NK Future Dual Concealed Shower Valve - Porcelanosa Noken NK Liberty Dual Concealed Shower Valve - Porcelanosa Noken NK Imagine Dual Concealed Shower Valve - 100060452 - NK Logic Thermostatic Shower Valves (Twin and Triple) - 100039544 - NK LOGIC - BELA 100065016 - N211000016 - NK LOGIC - BELA 100104972 - N111390022 - NK LOGIC - BELA 100104973 - N111390023 - NK LOGIC - BELA 100104974 - N111390021 - 100060463 - NK BASIC Wall mounted exposed thermostatic shower mixer 100059722Cartridge Measurements and InformationInstallation Type: Screw Fit (turn anti clockwise to remove from your valve)Total Cartridge Length (including thermostat element): 103.7mmLength of cartridge from top of spline to bottom of brass body (hexagonal nut): 101mmNumber of teeth on top spindle spline (which the temperature handle connects onto): 20Width of top spindle spline (which the temperature handle connects onto): 7.5mmNumber of teeth of second toothed spline (which the temperature stop ring connects onto): 45Width of second toothed spline (which the temperature stop ring connects onto): 20mmDiameter of screw thread: 35.8mmDiameter of top O'ring: 34.5mmDiameter of middle O'ring: 34.5mmDiameter of bottom O'ring: 34mmNumber of O'Rings: 3Material: BrassType: Screw inGauze Filters: 2Wax Element: Vernet (France) (at the bottom of the cartridge on the wax thermostat element, it will read . Vernet . France . ).Should your shower be having difficulties regulating water temperature, the likely problem is the thermostatic cartridge, especially for those in hard water areas.