A device for delivery of a radiopharmaceutical and, in some embodiments, delivery of a pharmaceutical agent are provided herein. A fluid path set comprising a confluence valve, a four-way valve, and one or more tubing sections which are designed to place some combination of a radiopharmaceutical source, a medical fluid source, and a pharmaceutical agent source in sterile fluid communication with a patient or a waste receptacle. Also provided are holders for the fluid path set, and a sterile fluid delivery kit comprising the holder and fluid path set. A fluid delivery system may accept the holder with the fluid path set installed and various sources of radiopharmaceuticals, pharmaceuticals, and medical fluids. The fluid delivery system allows for automated mixing and delivery of exact amounts of these agents to a patient while improving efficiency and safety, and reducing waste.