Valley Industries 4" Dual Scale Liquid-Filled SS Industrial Gauge; 0-160 PSI (4140GXB160) Model 40 Dual Scale Liquid-Filled SS Industrial Gauges These gauges are designed for any medium not corrosive to brass or bronze. Liquid-Filled gauges are recommended for reducing shock caused by pressure fluctuations or vibration. Movement - Brass Bourdon Type - C-Shaped in copper alloy up to 600 PSI and Helical in phosphor bronze above 600 PSI Pointer - Black enameled aluminum Case Material - 304 Stainless Steel Window - Polycarbonate - temperature compensating Dial - White aluminum Connection Size - 1/4" MNPT Connection Material - Brass Accuracy - ASME/ANSI B40.1 Grade A (2-1-2%) Fill Material - Dry, Glycerine, Silicone, Florolube Wetted Parts - Copper Alloy