"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. Connection Material 316 Brass, Connection Size in. 1/4 Male NPT, Accuracy Grade B, Dial White aluminum, Movement Brass, Range PSI 0-15,000, Window Material Acrylic, Case Material Grade B #410 Stainless Steel, Fill Material Glycerin, Recommended Use Air, gas, oil, water, Pointer Black enameled aluminum, Max. PSI 15,000, Gauge Diameter in. 2 1/2, Bourdon Tube Phosphor Bronze."