E Support 50Pack Blue Heat Shrink Butt Wire Electrical Crimp Terminal Connector 14-16 AWG Gauge Standard crimp and then seal heat shrink butt connectors Guaranteed to hold the strong crimps Dual-walled design, polyolefin tubing in outside and hot melt adhesive in inside Allows visual inspection, prevents corrosion, and provided a waterproof seal Blue connector: 14-16 AWG