Repair kit as shown pictured above includes a new cartridge and the toolset to extract and replace the old cartridge. The tools enable replacement to be undertaken without removing the whole diverter valve and come with detailed instructions. The job can be completed in under 8 minutes – see video on the Support page
Purchase price includes 1st class post.
Remember to add the isolation valve key if your boiler is a few years old as they can stick and be difficult to fully close.