I bought these for a house that was built in the 50's with basically two prong sockets. They work, but if you want to attach them to a ground screw it might take a bit more effort. The middle screws that hold the bezel covers in my house are just long enough for this. You can't go in far enough to hold the adapter and plate. This is partly because the loop on the adapters is about 1/8 inch from the back of the adapter. I ended up having to find a longer screw and remove the bezel from the socket to ensure a secure fit. Now I know why they design a single transducer with a wire sticking out to attach to the output screw.
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