1. Transparent window or water volume at a glance: The side of the water tank has a transparent window or a clear water level scale, so you can check the remaining water level without opening it. It is convenient to check whether the water has been filled before mopping, or to judge when it needs to be refilled. After the window is worn and blurred, the water tank can be replaced to restore clear observation. 2. Uniform water control, just the right amount of moisture in the mop: there is a capillary or air pressure water control structure inside the water tank, and the water outlet is uniform and stable. The mop remains slightly damp when mopping, which can effectively dissolve stains without leaving obvious water stains on the ground. If the water control of the water tank fails, it may cause the mop to be too dry or the ground to be too wet. 3. Precision leak-proof structure, no dripping/water seepage: the water outlet is sealed with soft rubber seal valve or silicone plug, which does not leak water before installation, and is closely connected with the machine outlet after installation. The seam of the water tank is sealed and is not easy to leak after long-term use. After the old water tank sealing ring is aged, dripping may occur and wet the ground. 4. Large-capacity design, mopping a large area at one time: The capacity of the water tank is optimized, and a single water injection can drag a larger area, reducing the number of frequent water additions during use. It is suitable for large apartments or families with wet mopping of the whole house. If the water tank capacity is too small or leaks, it will cause water shortage in the middle of mopping. 5. Easy installation, close with one button: no tools are required. Align the water tank with the card slot of the mop bracket on the fuselage, gently push it in, and it will be fixed in place when you hear a "click". When disassembling, press the buckle or toggle the switch to remove it. *It is recommended to check the water tank buckle every 3-6 months for looseness Compatible For Domoova DRV50，Robot Vacuum Cleaner Components