Description This pressure gauge is designed for pressure measuring and adjustment on the filter for swimming pool, spa, aquarium etc. Dial size : 2" Process connection: 1/4"NPT center back mount male Case : 304 stainless steel case and crimped ring Window : Polycarbonate Dial plate : aluminum, with pointer stop Pointer : Aluminum, black, DIN style Boudon tube : Copper alloy Movement : Brass Connection : Brass, one piece design Oil cap : rubber, gray color Filling : Glycerin filled, dampens the effect of vibration and pulsation; lubricates the movement and extends the life of gauge. IP class : IP67 Accuracy : +/-3-2-3% Pressure range : 0-35psi/250kpa dual scale Color zone, blue zone for filter 0-17.5psi, red zone for clean 17.5 to 35psi Working temperature : -4 to 140 deg F/-20 to 60 deg C Ambient temperature : 140 deg F/60 deg C maximum Measureman has 20 years rich experience in the measuring of pressure, temperature, flow, level industries, The "Measureman" branded products are the combination of continuous good quality and affordable price. "Measureman" products are selected and designed by professional engineers.