Pressure Relief Valve - Uncalibrated Field Calibration Sizes: 1"1/4, 1"1/2, 2" and 2"1/2 0.3-1.5 bar TEMPERATURE: -15°C A + 60°C Vacuum Relief Valve Field Calibration Sizes: 1"1/2 VACUUM = -0.3 bar / -0.8 bar TEMPERATURE = -15°C / +80°C