I've been an Electrician and Contractor for over 35 years. It is the safest, easiest to use and most reliable aluminum wire connector available today. They're a little bulky, but with careful use, they can be used in most situations. If necessary, replace the small J-Box with a new, larger plastic box. It's worth the effort. I would like to see the price go down a bit because it discourages low income people from using them and they are the most vulnerable to the loss of homes and lives due to aluminum wiring. This device performs "pigtail" quickly and reliably.
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