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