An improved saddle tee for branching a conduit from a main line is disclosed. The saddle tee includes a base unit that defines an opening for receiving a tap and interlocking jaws for securing the base unit to a main line. The tap may include a shaped portion for receiving a tool interface to rotate the tap to drive the tap into the main line. The tool interface could be secured to a power tool to enable rapid driving of the saddle tee into the main line. The saddle tee may also include offset arcuate interlocking jaws to enable the jaws to interlock around the main line with ease. Optional interface surfaces on the tap and base unit enable the tap and base unit to interlock to limit rotation of the tap relative to the base unit when the tap is fully inserted into the base unit.