Monastic waterworks and conduit house, originally constructed during the 12th century. The present Conduit House is probably on the site of and incorporates part of the original conduit house depicted in a plan of circa 1160. The waterworks plan indicates that the spring water was piped below ground from the Conduit House down the line of the present Military Road to the Cathedral precincts, the last tank of the series being placed against the city wall.