Wire nut connectors are meant for direct bury use for landscaping with no junction box required. Wire connectors are silicone filled to protect wires from water, dust and dirt. Connectors are certified UL 486D as a sealed wire connector system and the water and corrosion proof materials provide consistent, superior performance. These connectors are meant for wires ranging from size No.22 to No.8. The easy one-step installation does not require pre-twisting. Temperature rated up to 221 degree Fahrenheit. Connectors are not to be used in applications that require continuous submersion.