Differential Pressure Gauge, Gauge Nominal Dial Size 4 1/2 in, Basic Gauge Case Material Metal, Basic Gauge Wetted Parts Aluminum, Differential Gauge Connection Type FNPT, Differential Gauge Connection Size 1/8 in, Gauge Connection Location Back and Side, Differential Pressure Range Units in wc, Differential Pressure Range Value -0.50 to 0 to 0.50, Gauge Operating Temp. Range 20 Degrees to 140 Degrees F, Rated Total Pressure -20 in Hg to 15 psi, Standards EU RoHS II