Deutsch HD30 Series Receptacle. Size 24 shell or 43mm diameter. Contains 4 size 12 pins and 17 size 16 pins. Size 12 contacts are rated at 25A per circuit. Size 16 contacts are rated at 13A 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.