Mid-West Instrument P/N 120-AA-02-OO 0-100 PSID, Model 120, 2.5" Dial, 0-100 PSID DP Range, Plastic Case, Aluminum Body, Stainless Steel Piston Wetted Parts, 1/4"FNPT End Connections, 3000 PSIG Max. Working Pressure, 2% of FS Ascending Accuracy, Piston-Ty