These heat-shrinking butt splices-designed for use on 12-volt DC circuits-from Uriah Products can accommodate 16-14 AWG wires. They're coated with blue nylon insulation that shrinks under heat to form a protective watertight seal. The nylon is translucent, too, allowing you to visually inspect the connection. | Uriah 16-14 AWG Butt Splices 10 Pack in Blue