This question is regarding Mira Excel/Select Thermostatic Cartridge - 903.33

Mira Excel high / low pressure

In 1993 I fitted a Mira Excel TB Thermostatic Mixer Shower ~ and the box tells me it has a low pressure cartridge. Turning the control is stiff and it seems it is time to replace the cartridge.



1. Is the Mira Cartridge 903.33 at £97-02 the correct replacement cartridge ? (The part no is not the same as mentioned in my 1993 installation booklet that came with the shower).



2. Your website shows a Red Key to go with this cartridge. What is this for? When I fitted this shower in 1993 there was no key.



3. The present shower installation is gravity fed from a hot water cylnder and cold water tank in the loft. If I change my boiler to a more modern boiler ~ Combi etc ~ sometime in the distant future, will this shower with the new cartridge be compatible. I realise this will require different pipework.



Regards,

William
Asked 13 years ago by William

The Cartridges were high and low pressure, the current 903 33 by using the key changes it from High to Low, with a combi all you will need to do, assuming the pressure is high enough is switch it to high pressure.

Answered 13 years ago by The Shower Doctor

View Product and Order Online:

Do you require any further help with Tap or Shower Cartridges?

Please click the following link if you would like to see other answers or ask a question regarding the Mira Excel/Select Thermostatic Cartridge - 903.33

If you've landed here and this question is not about your specific product, please take a look at these similar items on our Mira Cartridges page. Alternatively, if you're looking for any other brands you should view our full range of Cartridges.

If you would like to buy this cartridge or look others from the same brand, please view our Replacement Mira Cartridges (All)

For any other support request please get in touch.