20PCS Red Insulated Straight Wire Butt Connector Electrical Crimp Terminal 18-22AWG Free Shipping Suits cable/ wire sizes: 0.5-1.5mm2 18-22 AWG For best results use a hot air gun until it reduces in size and the adhesive flows, filling gaps within the terminal Allows visual inspection, prevents corrosion, and provided a waterproof seal Dual-walled design, polyolefin tubing in outside and hot melt adhesive in inside Standard crimp and then seal heat shrink butt connectors