do i need to change the cartridge
If you have a cartridge with a purple butterfly behind the temp knob then if you remove the cartridge at the rear of the cartridge you can set the cartridge for high or low pressure.
If you have any other colour than purple then just try it and see and if there are any problems be prepared to change the cartridge.
Answered 9 years ago by Anonymous
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Mira Excel/Select Thermostatic Cartridge Assembly - 903.33
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