3M™ Performance Plus Wire Connector O/B+BOX. It offers a strong bite in a pigtail application so you get a long-lasting connection. An expandable spring lets you take in more wire uptake and reuse. The O/B+ is dual color-coded so this 1 connector replaces your traditional orange and blue connectors. Great for all types of jobs - from industrial and residential construction, to automotive, marine and appliance applications. Use with copper conductors ranging from 22 to 12 AWG. Built with polypropylene and thermoplastic elastomer material. Orange/blue connector is flame-retardant and operates in temperatures up to 221 degrees F (105 degrees C). Use on building wire rated 600V and on signs, fixtures or luminaries rated 1000V. UL Listed and CSA Certified.