GX16 16mm M16 Aviation Connector Plug Cover Waterproof Dust plastic/metal Cap Circular Connector Protective Sleeve
https://www.vogueparade.com/shopping/EN/5/1/1005003645375740/gx16-16mm-m16-aviation-connector-plug-cover-waterproof-dust-plasticmetal-cap-circular-connector-protective-sleeve//