I chatted directly with Philips Customer Service and they said that the brush cannot be ordered separately. You have to replace the whole handle. I was given an incorrect article number and two links to spare parts dealers in Germany, despite being told that I live in Switzerland. After a short search, I came across this: https://www.migros-service.ch/de... I only need the plastic ring with the blue bristles, but it doesn't seem to be available separately. Hope this helps.

Yes. It gives extra attachments which can be mounted on the pipe.