Ideal Electrical Twister Al/Cu Purple Wire Connector (30-265), Box of 100 — Aluminum-to-Copper Twist-On Wire Nuts with Antioxidant Filler

These are great for homes that have old aluminum wiring. The twister have penatrox inside, so no mess!

I am an electrical and lighting engineer. Most new light fixtures use aluminum instead of the traditional copper which is used in existing houses. Why you ask? Aluminum is cheaper. BUT that complicates things & the importance of this wire-nut cannot be overstated. When you have the termination of two different materials you need to use the proper protection. This wire-nut emits a clear coat onto the wiring to ensure arcing doesn’t happen. Very cool device, while a bit pricier, well worth the piece of mind to make sure that new light fixture you’re installing doesn’t burn down the house ☺️

Working well.

These wire nuts are for making copper to aluminum connection safe. They work perfectly but just be aware of the fact that the nut can only be used 1 time so make sure all your wire connections are correct before putting the wire nut on. If you make a mistake and then try to use the wire nut a second time the connection will not work and there will be no power. I learned first hand on this so learn from me and don’t try it. These are not cheap connectors but they are the correct connectors for connecting the two different materials.

Hard wired new GFCI outlet using These for PigTail connections from Al. to Copper. Also all old wire nutted Connects of Al. in box these are Excellent solution. Even Al. Solid to Al. Stranded wires. Gives firm grip On connections. You can see insulation curling around each other while twisting. Pricey but they come Prepacked with antioxidant gel. A must have for Aluminum wiring. Best Twisters you could buy!

These are the same as what you get at the big box stores, only cheaper. Used to connect aluminum and copper wiring. These are special because they are filled with ox-guard or other brand name of black nasty material that helps contain the wire connections and reduce chance of fire. Copper and aluminum wiring expands and contracts at different rates and arching can occur leading to fires. These are rated to prevent this from happening.

When it’s not feasible to replace aluminum wiring, these work well and are an approved method for “pigtail-ing” copper wires onto the aluminum wiring. This enables use of a wider selection of modern receptacles and switches that are only compatible with copper. Very useful to have.

Connecting Copper wire to Aluminum wire is NEVER a good idea, especially in residential wiring. When two different materials are place together {connected}, there is always that chance of corrosion or oxidation that can occur. I have seen something simply as a lamp assy aluminum wire corroded and burn in an electrical box inside the building's wall. Scary? Yes. Even though, these wire nuts might be spendy, they are the only twist type that is UL Listed for CU / AL connection. One important 'thing' follow their instructions carefully and DO NOT attempt to reuse this wire nut.