Twist On Wire Connector Color Red/Yellow For Conductor Material Copper Maximum Operating Temperature 221 Degrees F Maximum Voltage 1 000 V Minimum Wire Combination (2) 18 AWG Maximum Wire Combination (4) 10 AWG Contact Finish Zinc Contact Material Steel UL 94 Flammability Rating V-2 Maximum Conductors 4 Standards CSA Certified UL Listed Wire Connector Style Wing Fill Material Polypropylene Maximum Single Wire Size 8 AWG Minimum Single Wire Size 22 AWG