Brass movement with C shaped Boudon tube. 1/4in. NPT male connection. For use with air, gas, oil or water. Black enameled aluminum pointer, white aluminum dial and temperature compensating polycarbonate window. Glycerin filled to dampen pulse and vibration. Accuracy: ASME/ANSI B40.1 Grade A (2-1-2%). Range PSI: 0 - 60, Gauge Diameter (in.): 2 1/2, Connection Size (in.): 1/4 Male NPT, Bourdon Tube: C-Shaped, Pointer: Black Enameled Aluminum, Dial: White Aluminum, Movement: Brass, Accuracy: ASME/ANSI B40.1 Grade A (2-1-2%), Mount Type: Stem, Window Material: Temperature Compensating Polycarbonate, Fill Material: Glycerin, Recommended Use: Air, Gas, Oil, or Water