trevi blending valve (thermostat)

Told by plumber I need this for my shower. It’s quite an old trevi shower It has a cold and hot turn knobs. Can you help please?
Asked 4 years ago by Hanet Poyser, Chesterfield
www.showerdoc.com/trevi-boost-brass-thermostatic-cartridge-a963348aa

There is a list of showers that this item fits into at the bottom of this link.

Depending on the fault you may need a new cartridge.

Answered 4 years ago by Barrie Seabright

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