Piezometer Model EPU-20G (MTI.EWS.ER.M-EPU20G) The uplift pressure measuring device consists of a perforated/non-perforated pipe of 50 mm dia of adequate strength. The pipe is inserted in a drilled hole in the foundation from the instrumentation gallery to the required depth. To the other end of the pipe in the gallery is connected the uplift pressure meter or a Bourdon pressure gage.