mini stool water changer multifunction two in one for power supply and cleaning Non toxic PVC material The dropper is In non-toxic PVC, safe, odorless, flexible and can be used for a long time. Sustainable rubber head: Ecological rubber, non-toxic and tasteless, good elasticity, suitable for a long time Used between, a variety of colors can be selected. measurable use: it is very convenient to use when used as a dosing tool, such as a water quality controller, aquatic liquid fertilizer, nitrifying bacteria and Other liquids. 30ml capacity Product specifications The mini water changer is divided into standard and extensive models, with a variety of colors to choose from, and a Removable rubber head for easy cleaning. Remove waste and residual foods deposited at the bottom of the small aquarium and can also be used as a water change tool for the mini aquarium.