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. Range PSI: 0 - 5,000, Gauge Diameter (in.): 2 1/2, Connection Size (in.): 1/4 Male NPT, Bourdon Tube: Phosphor Bronze, Pointer: Black Enameled Aluminum, Dial: White Aluminum, Case Material: Grade B #410 Stainless Steel, Connection Material: 316 Brass, Movement: Brass, Accuracy: Grade B, Window Material: Acrylic, Fill Material: Glycerin, Recommended Use: Air, Gas, Oil, or Water