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. NOTE Image shown is representative of the guage style, not necessarily identical to what will be received. Connection Size in. 1/4 Male NPT, Bourdon Tube C-shaped, Movement Brass, Recommended Use Air, gas, oil, water, Gauge Diameter in. 2 1/2, Max. PSI 3,000, Range PSI 0-3,000, Accuracy ASME/ANSI B40.1 Grade A 2-1-2, Fill Material Glycerin, Pointer Black enameled aluminum, Dial White Aluminum, Window Material Temperature compensating polycarbonate, Mount Type Back.