This is a Nuova Ricambi blind rubber filter disk for backflushing groupheads.
Simply apply to any portafilter head with your regular filter basket still installed, add some Revolution cleaner and clean away.
A universal part.
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I had been looking for a way to backflush my Pasquini Livietta T2, but it has an unusually-sized portafilter (smaller than standard). Various inserts that I've ordered did not fit, but this wors, so that's great. BUT, the item that I got was not the same as the one pictured. The picture shows what appears to be a sturdy non-black rubber, but what I got does not read "Nuova Ricambi" (it doesn't have any markings, actually), and it's black rubber... which means it smells like rubber. Also, I wish I had gotten instructions. You have to set up the portafilter with the filter in place, then place the disc inside the filter with the little nubbin facing up. Any other way (disc under the filter, for example, where it actually fits nicely) won't work and you won't get a good seal.