Associated with 7198, a series of four tufo blocks running NS in Room H5, but the purpose is unclear. Appears to run underneath wall 7117 between rooms H5 and H6.
photo taken from west
view from north
photo taken from east
Model of Rooms H4 and H5
3 large square tufo blocks (and one concrete one) along E wall of Room 5; Line of small stones along W face of blocks 7198
Sketch of SUs 7221, 7234, 7242, 7257.