Graham-Whites Custom Gauges have long been the standard in Pressure and Flow analog gauge technology for both the heavy rail and rail transit industries. From a pressure stand point, our unique Duplex Pressure Gauge series is an extraordinary single gauge that delivers two separate pressure readings simultaneously. This dual function does the work of two single gauges, requires half the panel space, and costs less. A Series of Air Flow (AF) Indicator Gauges and Air Flow Method (AFM) Indicator Gauges are also available. Both are enhanced with an adjustable base to measure air system leakage across a 19/64" orifice using a pressure differential (psi) or airflow (cfm) scale. All GW gauges are designed with high quality bronze bourdon tubes and precision phosphor bronze movements for optimum performance and reliability. An integral quick disconnect and test feature makes all GW gauges easy to install within your control stand or console and inspect in place using the GW 706-000 Air Gauge and Pressure Switch Tester. An assortment of GW "Quick Disconnect" Test Fittings are available for quick and easy testing of stand alone air gauges and pressure switches.