Deutsch HD30 Series Receptacle. Size 18 shell or 38mm diameter. Contains 2 x size 16 sockets & 18 x size 20 sockets rated at 7.5A 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.