"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. Mount Type Stem, Max. PSI 600, Accuracy ASME/ANSI B40.1 Grade A 2-1-2, Bourdon Tube C-shaped, Pointer Black enameled aluminum, Connection Size in. 1/4 Male NPT, Range PSI 0-600, Gauge Diameter in. 4, Fill Material Glycerin, Recommended Use Air, gas, oil, water, Movement Brass, Dial White aluminum."