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Speaker cable that runs underground is often subjected to more hazards than running cable inside. That's why we recommend CL-rated direct burial cable terminated with our waterproof wire nut connectors. These inexpensive and easy to connect devices are suitable for all wire splices, especially those exposed to condensation, water, vapors, dust and dirt and are excellent insurance to protect your wire from corrosion or damage. Our connectors have a silicone sealant to keep your wires dry.