Brass movement with phosphor bronze Bourdon tube. Grade B #410 stainless steel. 1/4in. NPT 316 brass male connection. Grade B accuracy. For use with air, gas, oil or water. Black enameled aluminum pointer, white background and acrylic window. Glycerin filled. Dial White Aluminum, Connection Size in. 1/4 Male NPT, Recommended Use Air, gas, oil, water, Range PSI 0-15,000, Gauge Diameter in. 2 1/2, Case Material Grade B #410 Stainless Steel, Connection Material 316 Brass, Accuracy Grade B, Movement Brass, Pointer Black enameled aluminum, Bourdon Tube Phosphor Bronze, Max. PSI 15,000, Fill Material Glycerin, Window Material Acrylic.