Hopefully this one will last another twenty years, despite the apparent flimsiness. It does seem expensive for what it is though. It was a reasonably straight swap for the twenty year old existing unit and could be changed without disturbing the cistern. However, there are a couple of points worth mentioning: It was a reasonably straight swap for the twenty year old existing unit and could be changed without disturbing the cistern. However, there are a couple of points worth mentioning: The top button fitting that sits above the actuation mechanism was not the same as my old unit (D1D) so I had to reuse the existing fitting, which was a simple job. It just unclips and slides off. Obviously the design of the push button fitting has changed over the years. Hopefully this one will last another twenty years, despite the apparent flimsiness. It does seem expensive for what it is though.