A: Hi Graham
Unfortunately the cartridge is a sealed unit.
You will have to find out which cartridge you have.
Pink for a combi or multipoint and grey any system with balanced (equal) pressures.
Remove the on/off knob should just pull forward however it can be a bit of a bu**er then remove the 4 screws that hold the temperature knob in place, remove the temperature knob and then you will see the colour of your cartridge.
If you already have the cartridge and want to carry on and replace it you will have to turn the water off to the shower.
Then remove the cartridge you will need to remove the 4 large screws at the side of the cartridge these have posidrive or ‘Torx’ T25 heads depending on there age.
Pull the cartridge forward to remove.
Before fitting the new cartridge you should replace the small ‘O’ ring at the rear of the body this is another bu**er to change……(something like a crochet hook or the sort of thing that dentists use will help)
It is not always necessary to replace this ring however if there any problems with the cartridge, the first question you will be asked is did you replace the ‘O’ ring? if the answer is no! then you will be told to phone back once it has been replaced.
When you refit the cartridge make sure that the slot, (usually on the right of the body ) the gasket and the body all line up properly then retighten the screws.
Answered 385 days ago | The Doc