WEATHERPROOF® Harsh-duty wire connectors have been designed specifically to handle wire connections exposed to damp/wet and direct bury/below grade conditions. Each connector is pre-filled with a long-lasting, 100% silicone sealant that protects your electrical connections from the most severe environments. Thicker thermoplastic shell for extreme durability in harsh environments. Live-action square-wire spring for secure and long-lasting connections. Connected and Protected in one easy, time-saving process.