Industrial Compound Gauge, Accuracy +/-1.0 Percent, Gauge Case Material Stainless Steel, Nominal Dial Size 4 1/2 in, Lens Material Acrylic, IP/NEMA Rating Not Rated, Hazardous Location Rating Not Rated, Compatible Process Media Non-Explosive Gas Or Liquid That Do Not Crystalize And Corrode Copper Alloy, Sensor Material Copper Alloy, Socket Material Copper Alloy HPb59-1, Process Connection Type NPT, Process Connection Gender Male, Process Connection Location Bottom, Process Connection Size 1/4 in 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. -