"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. Gauge Diameter in. 4, Fill Material Glycerin, Window Material Temperature compensating polycarbonate, Dial White aluminum, Accuracy ASME/ANSI B40.1 Grade A 2-1-2, Max. PSI 160, Pointer Black enameled aluminum, Connection Size in. 1/4 Male NPT, Bourdon Tube C-shaped, Movement Brass, Mount Type Stem, Range PSI 0-160, Recommended Use Air, gas, oil, water."