Seal conduit couplings, conduit-to-cable breakouts and terminal lug barrels with this 3M 8420 Connector Insulator. It works well for dielectric-insulated wires and splicing in 1000V-rated applications. Installation is easy, and you won't need extra tools to get the job done. Use this convenient cold shrink insulator for physical protection of air-insulated, high-voltage lugs and connectors; its also good for when you need to insulate submersible or direct buried dig-in repairs and secondary splices. The black EPDM rubber construction is free of sulfur and chlorides, and it provides a waterproof seal while remaining sturdy and strong in any weather. You can trust in the quality and safety of this product, which is ANSI Certified and RoHS 2011/65/EU Compliant.