Yeah, I tried that. I took it to the place it was bought from - according to a local plumber, are the only local company with any chance of having something like this. They didn't have any or know who makes it. They suggested Methven/Deva, so I emailed Methven with a photo but they said it's...
Hi, can anyone identify the tap insert in this photo? The company it was bought from don't stock it any more, and don't know where it came from.
The metal spacer and rubber washer at the bottom are supposed to be held on by a central rod that screws into the main body of the tap insert...