22-18 Gauge Heat Shrink Insulated Butt Splice Connectors are adhesive-lined and when utilized properly will create a permanent enviromental and waterproof seal. Recommended for marine, automotive, outdoor, or harsh environment use. The translucent heat shrink allows you to inspect the connection. Rated for use up to 600 volts use and temperatures up to 221°F (105°C). High quality heat shrink butt splices that are Made in America.