Which cartridge

How can I tell I need an Aqualisa 022801 or an 022807 cartridge? I have an Aquastream power shower. The cartridge is grey in front of dark grey/black. It has only 3 screws, not 4, to fix the temperature setting adjuster. Thank you
Asked 2 years ago by Steve Payne, Chelmsford Essex
The 022807 comes with a cam, but all cartridges have 4 screw holes on the face. You just cant see the 4th.

Answered 2 years ago by Barrie Seabright

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