SOLOOP 100Pcs Insulated Heat Shrink Butt Wire Electrical Crimp Terminal waterproof Connector 18-22AWG Red 100% brand new and high quality. Guaranteed to hold the strong crimps. Standard crimp and then seal heat shrink butt connectors. Allows visual inspection, prevents corrosion, and provided a waterproof seal. For best results use a hot air gun until it reduces in size and the adhesive flows, filling gaps within the terminal.