Deutsch HD30 Series Plug. Size 18 shell or 38mm diameter. Contains 2 size 4 sockets and cavities 1, 2, 5 and 6 are blocked out. Size 4 contacts are rated at 100A per circuit. These industry proven connectors are environmentally sealed to IP67 standards. Able to be used in both inline and bulk head applications. They have a quick connect bayonet style coupling. Specifically designed for the truck, mining and construction industry.