3M Scotchlok Heat Shrink Butt Connector ensures an ideal fit with great performance. It withstands a maximum temperature of 221 degrees F (105 degrees C). Electrolytic copper construction offers good conductivity and a tin-plated finish resists corrosion.3M Scotchlok Heat Shrink Butt Connector is color-coded for quick and easy identification of the wire size required. This versatile connector has a seamless barrel that is covered by see-through, pre-insulated transparent tubing to provide seal resistance to water, salt and other contaminants when crimped and shrunk. The heat shrink tubing offers better pullout strength and strain relief when shrunk.