Ashcroft Type 1490 Glass Filled Polysulfone Low Pressure Diaphragm Gauge, Beryllium Copper, Brass, Polysulfone and RTV Silicone Wetted Material, Brass Socket and Movement, 1% Optional Accuracy, 2-1/2" Dial Size, 1/4" NPT Lower Connection, 0/25 kPa Pressure Range