Easy-Splice Direct Burial Splice Kit with Rubber Cover 6 AWG - 350 MCM Direct Burial Splice Kits are dual-rated for use with copper and aluminum cable. These kits consist of an in-line mechanical set screw connector pre-filled with oxide inhibitor and an EPDM rubber insulating cover to ensure a watertight seal. Rated 600 Volts APPLICATIONS: Street lights, motor connection, irrigation systems, HVAC, outdoor lighting, and over wire connectors for a secure seal.