Push In Wire Connector - Pigtail Wire Connector

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A push wire connector makes it easy to extend the length of a short wire.
Most companies make the electrical connector work for a wide range of wire sizes. The types I have used will accommodate wires from 12 to 22 gauge. You can also purchase push wire connectors that have from 2 to 8 ports.
Check your local codes, but in our area they are popular to extend short wires in a box or to create a pig tail wire.

Waterproof Wire Connectors

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For connecting wire outside, you should use wire nuts that are designed for outside use.
Exterior rated wire nuts are filled with a waterproof silicone to keep your wires from getting damp.
Outdoor wire connectors are great for landscaping wire, exterior outlets and lighting.