Mid-West Instrument P/N 140-AC-12-OO 0-75 PSID, Model 140, 4.5" Dial, 0-75 PSID DP Range, Plastic Case, Aluminum Body, SS Trim, Buna-N Diaphragm Wetted Parts, 1/4"FNPT Top / Bottom Connections, 3000 PSIG Max. Working Pressure, 2% of FS Ascending Accuracy,