My son, an engineer, introduced me to them. They are a vastly improved replacement for the old fashioned wire nuts. They are easy to use and provide a secure connection, unlike the wire nuts they replace. I think three wires are better to keep on hand. This is what you need for a simple parallel connection. If you just need to connect, just leave a hole. You need to strip the wires. For larger gauge wires, the insulation should be stripped enough to allow the wires to enter the holes, but not so much that they are left open to accidental contact. Now these will be my favorite connectors.
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