I remembered it because I thought it odd that they did not consider it cleanable... or that was my interpretation of why they said it had to be replaced...
Perhaps there is a screen filter in it or something like that ? They could have mentioned that if there was... maybe they just wanted to sell new ones at any opportunity... and knew that was not going to be an aftermarket item...

The first time someone has a Black Death and replaces one of these someone needs to carefully split it open and do an autopsy on IT....