Waterproof IP68 External Junction Box, 2 Way Plug Line M20 Coaxial Cable Connector Wire Range 5 to 15mm Outdoor External Electric Power Cord Boxes (Black) : Amazon.co.uk: DIY & Tools
Old Satellite box, can I remove all the coax cables myself? is there power in there? : r/askanelectrician
wiring - How do I properly feed coax through an outside wall? - Home Improvement Stack Exchange