Pressure Manometer Product Type Hydronic Differential Pressure Manometer Flowmeter Type Hydronic Differential Pressure Accuracy 2 Percent Connection Size 1/4 in Connection Type NPT Compatible Flow Material Compressed Gases Water-Like Liquids Media Temperature - Maximum 185 Degrees F Media Temperature - Minimum -4 Degrees F Viscosity - Maximum Not Applicable Voltage - Maximum Not Applicable Housing Material Fiberglass-Reinforced Plastic Rotor Material Not Applicable