"Brass movement with C shaped Bourdon 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. Connection Size in. 1/4 Male NPT, Max. PSI 3,000, Gauge Diameter in. 4, Bourdon Tube C-shaped, Range PSI 0-3,000, Window Material Temperature compensating polycarbonate, Dial White aluminum, Recommended Use Air, gas, oil, water, Movement Brass, Accuracy ASME/ANSI B40.1 Grade A 2-1-2, Fill Material Glycerin, Pointer Black enameled aluminum, Mount Type Stem."