1. Dimension Optimization: Fully compatible with a drainage aperture diameter of 7.6 cm based on actual measurement data. The clearance size setting calculates the thermal expansion coefficient of resin parts to absorb deformation caused by temperature differences, preventing loosening during longterm use. 2. Efficient : Simply the damaged flapper to stop persistent leaks. Replacement kits restore reliable drainage operations, reduce excessive water consumption, and contribute to lower monthly utility bills. 3. Designed for LongTerm Use: The PVCbased structure ensures durability. It is wearresistant, maintains flexibility, and provides stable sealing performance over extended periods, effectively preventing water leaks. 4. Hassle Installation: Visualizes the workflow with colorillustrated instructions. An intuitive installation system eliminates trial and error. Smart devices are compatible with conventional products, requiring no unnecessary adjustments.