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macOS 12.0 Monterey

I just received my HP OfficeJet Pro today. And there is a white piece plastic thing inside of the printer that maybe fell out of somewhere (can’t find any place to reattach).

It has four small circles on it and those circles’ size match with the holes on the in cartages (where ink coming out from). 
The printer itself works functionally without this white piece plastic thing. But still want to know what it is.

Afraid the printer will not work functionally later on.

image.jpg

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