We somehow unintentionally threw away the original door and bought it as a replacement rather than buying a brand new dust box (which, if you call iRobot, is your only option). It fits perfectly on my 890, but since it's not clear plastic, Roomba thinks the dust bin is full, so I'm giving it 3 stars. If you can put up with the always-on empty cart light, which I do now, then this replacement works just fine.
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