125pcs Heat Shrink Butt Connectors, Sopoby Electrical Wire Connector Set, Waterproof Marine Automotive Crimp Terminals Kit, 22-18GA Copper, Red Material: Polyamide Hot-melt Adhesive. Waterproof --- Ideal used in Outdoor, Marine and Automotive Applications. Performance --- High Tensile Strength, Resistance to stretch and mechanical damage. Usage --- Heating with a hot air gun until it reduces in size and the adhesive flows, filling gaps within the terminal. Operating Temperature: -55125; Minimum Shrink Temperature: 80; Fully Recovery Temperature: 130.