Adapters fit 10/3 wire but I had to remove the plastic clips to make them slide (pictured). When power is applied both ends light up, not just one side like some other adapters, and they clamp individual wires very well. However, they are in no way waterproof or sustainable. I had to fill them with clear silicone (pictured) to keep water out as I will be using them outdoors. I don't recommend you to buy them if you intend to use them in a humid environment.
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