This is a wire nut replacement. They are reusable - I like it. They do the job more accurately. It's a great concept, but needs a little tweaking. The hole for the chain connection confirmation probe is too small. I've tried 3 or 4 different feeler gauges and they all had to be inserted into the hole - the hole is 1/32-1/64 larger and that would probably be fine. Often the wires didn't make contact and had to be reinserted - the lever had to be lowered all the way down - sometimes it could get stuck. I would give 3.5 stars but it's either 3 or 4 so 3.
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