GX12 12mm M12 Aviation Connector Plug Cover Waterproof Dust plastic/metal Cap Circular Connector Protective Sleeve
https://www.vogueparade.com/shopping/EN/5/1/1005002967385362/gx12-12mm-m12-aviation-connector-plug-cover-waterproof-dust-plasticmetal-cap-circular-connector-protective-sleeve//