Model 54 All Stainless Steel Liquid-Filled OEM GaugesThese gauges are designed for any medium not corrosive to stainless steel. Liquid-Filled gauges are recommended for reducing shock caused by pressure fluctuations or vibration.Movement - Stainless SteelBourdon Type - 316 Stainless SteelPointer - Black enameled aluminumCase Material - 304 Stainless SteelWindow - PolycarbonateDial - White aluminumConnection Size - 1/4†MNPTConnection Material - 316 Stainless SteelAccuracy - ASME/ANSI B40.1 Grade B (3-2-3%)Fill Material - Dry, Glycerine, Silicone, FlorolubeWetted Parts - Stainless Steel