This block seems to belong to the re-purposing of slab floor 7130 to be used as some kind of drain, or even a latrine. If the latter, then this might have served as a bench.
E-W ashlar wall forming E part of S limit of Room 1 and Opus mixtum wall built on top of wall 7057 and Tufo slab floor at N end of Room 3 and Ashlar wall running N-S at E limit of Room 3 and Tufo block and mortar on slabs 7130 and Upright ceramic tube south of wall 7131 and Opus reticulatum wall S of floor 7130 and Fill of circular cut S of wall 7131 and Petit appareil wall running N-S at W limit of Room 3 and Ashlar block aligned E-W in Room 3, covered by wall 7079 and Buttress of tufo blocks built against W side of ashlar wall 7078 and Concrete threshold between walls 7079 and 7080 and Petit appareil wall running N-S south of wall 7079 and Buttress of tufo blocks S of buttress 7097
View from west