Round Boiler Gauge, Boiler Gauge Nominal Size 2 1/2 in, Gauge Connection Location Center Back, Gauge Connection Type MNPT, Gauge Connection Size 1/4 in, 0 to 75, psi, Gauge Accuracy +/-3-2-3 Percent, Basic Gauge Case Material Steel, Basic Gauge Wetted Parts Brass / Bronze, Basic Gauge Lens Material Plastic, 60 Degrees to 260 Degrees Boiler Gauge Temp. Range - F, Temp. Range (C) 20 Degrees to 120 Degrees , Temp. Accuracy +/-3 Percent, Case Material Steel, Case Color Black, Socket Material Brass WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. - Lead