FastLok Wire Connectors (Stocked Product), $3

Designed for 10.5 (1.5mm) to 14.5 (2.5mm) gauge wire.

The Fastlok is an easy, convenient way to create an in-line splice very close to the full strength of the wire. Pull tested to withstand more than 1,580 pounds of breaking strength, which is stronger than similar gauge splicers.

The Fastlok is reusable, able to be retightened, and works well for ends, brace wires, and regular splices.