This rubber dropper is used in the chemistry laboratory. Rubber dropper consists of two things rubber bulb and a glass tube or plastic tube (We manufacture in a plastic tube). The rubber bulb is placed upon the glass or plastic tube. The rubber bulb act as a vacuum as a source for filling chemical reagents through this glass or plastic tube and also controls the flow of liquid throughout the tube. The size of the rubber bulb is commonly used to consider the number of reagents to be used by the pressure of vacuum filling. We manufacture rubber droppers according to the size, color, and requirements of our customers.