We have a concealed shower mixer in our bathroom and over the last few months, it's slowly reduced the flow of hot water to the shower.
I have read about this and understand that I need to remove the central cartridge. HOWEVER, when I finally cut away enough tile to see where the water enters the mixer, there are no valves, just two huge screws. I tried tightening them and they wouldn't budge. I then tried loosening them and water started to seep out... So I screwed them back on. London story short - I'm figuring that they aren't going to help.
Will I need to turn the water off at the mains to do this?
Also, any idea how I can find out which cartridge I need to replace this with?
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