A manifold attached to the UAV and a cartridge removably and replaceably attached to the manifold. Inside the cartridge is a removable insert for drawing contents out of the cartridge with a suction tube selectively positioned in fluid communication with a pump for removing chemicals from the cartridge for application by the UAV. The suction tube comprises a plurality of baffles around its circumference for dampening movement of the chemicals in the cartridge while the UAV is in motion.