Cannot unscrew the joint without removing wiring (to separate the connector all wires need to be unscrewed).These fully submersible power cable joints are rated at IP68, this means;IP6* = No ingress of dust; complete protection against contact (dust tight);IP*8 = Suitable for continuous immersion in water;SAFETY:As with any kind of electrical modification we ALWAYS recommend that a certified electrician is used to install products such as these.We also suggest the use of an amp meter after installation to ensure installation has been completed correctly.Only use with power cable39; that are 0.75mm standard power cable thickness (commonly known as 3 core power cable).It is recommended that you complete regular checks of all included O-Rings.When reassembling each part MUST be tightened as tight as physically possible to ensure that the O-rings are tight to the power cable.