WeatherProof™ and UnderGround™ wire connector is UL listed to 486D for use in damp/wet locations. Handles wire sizes from #18 to #8 AWG copper, minimum of 2 #18 AWG, maximum of 3 #10 AWG. Swept-wing design for comfort and greater leverage. Hexagonal shape allows connectors to be applied with standard nutdriver. Silicone-based sealant protects against moisture and corrosion. Easy to apply pre-filled twist-on wire connectors. Live-action, square-wire spring. No pre-twisting required. Shell rated for 105° C.