Drip chambers, burettes and other IV set components are described herein. An IV set component described herein comprises a chamber body, an inlet portion, and a disk valve. The chamber body defines a chamber volume and an outlet. The chamber volume is in fluid communication with the outlet. The inlet portion is coupled to the chamber body, the inlet portion defining an inlet, a priming port, a drip port. The inlet is in fluid communication with the priming port and the drip port, and the priming port and the drip port are each in fluid communication with the chamber volume. The disk valve is coupled to the inlet portion. The disk valve is movable to direct flow from the inlet to the priming port in a first position and to direct flow from the inlet to the drip port in a second position.