Prefilled with silicone sealant, Dry and Damp, Waterproof and Underground twist-on connectors are designed to coat each wire with silicone as it enters the connector. The sealant eliminates internal arcing, sparking and flashover to significantly reduce the risk of fire. All connectors are UL listed and CSA approved, and the Underground connectors can be installed without a junction box directly into the ground while meeting National Electrical Code standards.