"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, Fill Material Glycerin, Gauge Diameter in. 4, Movement Brass, Bourdon Tube C-shaped, Pointer Black enameled aluminum, Connection Size in. 1/4 Male NPT, Range PSI 0-600, Dial White aluminum, Recommended Use Air, gas, oil, water."