Cartridge replacement?

Hello-our cartridge makes a thumping\rattling noise when any cold tap or the toilet cistern stops filling. The cartridge is working fine. Not sure if I need to replace it and if you think I do it's a A3101 not sure of age of it. Would this be the correct cartridge? Thank you John
Asked 4 years ago by John Barnes, Durham

Answered 4 years ago by Barrie Seabright

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