This concrete plug, along with the ashlar blocks of 7354, likely acted as a plug for the possible threshold 7353 between room H-9 and room H-11. It is thought that 7353 is a previous threshold for room H-9, perhaps giving access to the Via Praenestina, which was later renovated and possibly plugged by these ashlar blocks 7354 and this concrete plug 7355. The addition of this concrete plug 7355 to the south of 7354 likely assisted in the completion of the N/S running party wall between room H-9 and H-11.