These 16-14 AWG blue heat shrink butt connectors provide a secure, watertight solution for joining and repairing electrical wires in automotive, marine, and industrial applications. Constructed with a high-quality tinned copper barrel, they offer excellent conductivity and corrosion resistance for long-lasting performance. The heat-activated adhesive lining inside the polyolefin tubing forms a strong seal when heated, protecting connections from moisture, dirt, and other contaminants. Designed for easy installation, these connectors ensure a strong mechanical crimp combined with a durable environmental seal, making them ideal for harsh or outdoor environments. The blue color coding allows for quick identification of the correct wire gauge, while the heat shrink design provides strain relief and prevents wire pull-out. Packaged in a convenient 100-pack, they are an efficient choice for professional electricians, technicians, and maintenance personnel seeking reliable and durable electrical connections.