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