Thermostatic Cartridge for Reliance Heatguard SKIT 200 001 shower valves (SKIT200001)This cartridge can be used as a replacement for the following Reliance exposed and concealed shower valves and bars: - Contemporary Heatguard BSM bath shower mixer with dual controls - Classic Heatguard ES exposed thermostatic mixer shower with dualcontrols - Reliance Heatguard DC150 Shower Valve - Reliance Contemporary Heatguard BSM PARENT-22 - Reliance Contemporary Heatguard BSTechnical Information and MeasurementsTotal 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 . ).Temperature stop ring not included.The bottom of the cartridge comes in different designs. If your cartridge is quite flat at the bottom, this cartridge will work. If your cartridge has a hexagonal fixing at the bottom, this cartridge will fit.Replacing your thermostatic cartridge should make your shower operate like it's new again and will fix any water problems you may be experiencing that have been caused by the thermostatic cartridge. Replacing the cartridge is easy. Simply unscrew the old cartridge, screw the new one in and calibrate the temperature to 38 degrees Celsius at the temperature stop ring point.