3M™ Scotchlok™ Color-Coded Heat Shrink Butt Connector ensures an ideal fit with great performance. The seamless barrel is covered by an adhesive-lined polyolefin tubing to offer moisture-seal protection. 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.