IDEAL 30-1765S Twister Al/Cu Wire Connector, 65 - Purple, 1 lb. (Pack of 10)

Working well.

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 ☺️

These work well on a project that someone put cooper and aluminum wires together. They are expensive but cheaper here than local suppler.

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.

My house was originally wired with aluminum. I use these where the screw-in connectors are too big. I have also had copper wires installed for appliances that create heat.