Reserve tank, section.
Drawing labels, details, and other text information extracted from the CAD file (Translated from Spanish):
llp, ventilation, llp, lim., inspection cap, hn comes from tank., splicing bridge, reserve tank drinking water capacity, pending, hn comes from tank., splicing bridge, reserve tank raw water capacity, pend., llp, llp, lim., llp, lim., pend., inspection cap, Automatic switch., vacuum switch., sealed with seals., Automatic switch., sealed with seals., vacuum switch., ventilation, of tank. hn, automatic., sealed with seals., llp, llp, ventilation, llp, vacuum switch., of tank. hn, automatic., sealed with seals., llp, llp, ventilation, llp, llp, vacuum switch.