This 1/4 Inch Lead Free Bottom Entry Pressure Gauge Is Used In Commercial, Residential, And Institutional HVAC Applications. It Features An ABS Polymer Case, Kostil Polymer Window, 1/4 Inch NPT Connection, And Copper Alloy Bourdon Tube Sensing Element With ASME Type B Accuracy. This Gauge Features A 4 Inch Dial With Pressure Rating Scale From 0 To 60 PSI.