Review on Sopoby Electrical Disconnect Assortment with Connectors by Girish Underwood

These gizmos make a great replacement for soldering irons, shrink wrap and electrical tape. A little care in aligning the ports correctly and a reasonable amount of effort will produce excellent results. I don't recall if there are any warnings against using them in standard household wiring, but I would reserve them for automotive and low voltage applications if unsure of your electrical skills. Just be careful to avoid open connections.