"1.5in. dry back-mount gauge has brass movement with C-shaped Bourdon tube. 1/8 male NPT male connection. Grade B accuracy. Designed for use with air, gas, oil or water. Black enameled steel case, aluminum pointer, white aluminum dial and acrylic window. Bourdon Tube C-shaped, Case Material Black enameled steel, Accuracy Grade B, Movement Brass, Pointer Aluminum, Mount Type Back, Recommended Use Air, gas, oil, water, Window Material Acrylic, Connection Size in. 1/8 Male NPT, Dial White aluminum, Gauge Diameter in. 1 1/2, Max. PSI 30, Product Type Gauge, Range PSI 0-30."
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