Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
Do you have a link or title of the YouTube video i can look up? Most aren't relevant to this type of unitHave you tried an internet search? Seems to be a few YouTube videos, one suggests some lugs at the bottom to push in?
Reply to the thread, titled "Caroma smartflush washer replacement" which is posted in UK Plumbers Forums on Plumbers Forums.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.