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. UL Listed, CSA Certified and RoHS 2011/65/EU Compliant.