When heat shrink insulation is a must, trust the 3M 8420 Connector Insulator to get the job done right. It doesn't require any tools to install, it creates a seal that keeps out all moisture that could short your connections, and it maintains its pressure so your applications last longer. For added versatility, this connector insulator can be used for direct buried or submersible, dig-in repairs, insulating secondary splices, and as physical protection for high-voltage, air-insulated lugs or connectors. It's ANSI Certified and RoHS 2011/65/EU Compliant for use on cable splices and solid dielectric insulated wires.