Prevent water leakage and seepage: Old water tanks are prone to aging, cracking, and poor sealing. Replacing the water tank improves sealing, preventing water leakage or dripping during mopping and protecting the floor. More even and stable water flow: Aged water tank outlets are easily clogged or uneven. After replacing the water tank, water flows smoothly, resulting in more even and clean damp mopping. Protect the floor from moisture damage: After replacing the water tank, water control is precise, preventing excessive water, avoiding floor swelling, deformation, or water marks. Reduce machine faults and repairs: Water leakage can corrode the motor, circuit board, and internal components. Replacing the water tank effectively protects the main unit and reduces malfunctions. Compatible for GUTREND， ECHO G520