Cartridge
You would need to send a photo with the knobs removed because it could be a 1500 series valve
www.showerdoc.com/sirrus-1500-thermostatic-shower-shower-spares
In which case this is the service kit
www.showerdoc.com/sirrus-1500-style-valve-seal-service-kit-sk1500-1
or the 1600 series valve
www.showerdoc.com/sirrus-ts-1600-thermostatic-shower-valve-shower-spares
In which case this is the service kit
www.showerdoc.com/sirrus-1600-series-valve-seal-service-kit-sk1600-1
Cartridges are no longer available for either valve.
Answered 6 years ago by George Thomson
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Armitage Shanks Starlight and Nuastyle Shower Spares
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