Non-catalytic component of the RNA exosome complex which has 3'->5' exoribonuclease activity and participates in a multitude of cellular RNA processing and degradation events. Component of the RNA exosome complex. Exos-4.1 and tin-9.2 are transcribed on a dicistronic transcript where exos-4.1 is the upstream transcript and tin-9.2 the downstream. Belongs to the RNase PH family.