Not for 12 AWG with jacket. It is suitable for 12 AWG bare wire. Therefore, you must strip the wires along the entire insertion length of the connector, and the bare wire will inevitably be exposed on the outside of the connector. In that case, you can assume those 12 gauge wires are very tight to get there. No, the lever closes, but with a little effort, the wires slip out. 14awg have not tried.
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