UPR Series plugs and receptacles from Appleton Group simplify specification in hazardous locations. A UPR plug can also be used safely in a standard, nonhazardous area when connected to an interlocking nonhazardous receptacle. Compact, lightweight and corrosion resistant, UPR Series plugs and receptacles are ideal for portable or stationary electrical equipment, such as industrial lighting systems, heaters, conveyors, motor generators and pumps. The 16- and 32-amp models are constructed of nonmetallic polyamide for corrosion resistance, and provide safety features such as color coding, mechanical interlock and a keyed design. A lockable external switch complies with IEC 60309-1, and keeps the receptacle locked while giving visual status confirmation. 800/621-1506; www.appletonelec.com