BB Series is a thread-to-connect. It can be widely used in various application. This application be connected under pressure and less spillage or non-spillage. BB Series can be suitable used in connecting equipment of the hydraulic lines like power tongs, swivels and mobile drillings, it also windely used dump tracks and dump trailer to connect with to wet line hydraulic system. And it also suitable used in submersible pumps, engine test stands, and the equipment require connect under high pressure or high liquid transfer.