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- The remaining water does not mean that the product was previously used. Tips Uninstallation Existing Toilet Seat 1. Remove the fixing nuts of the existing seat and separate the existing toilet seat 1 and the seat cover 2. . Keep the removed seat and the removed seat cover in a shaded place. Installation the Product 1. Turn off the main water supply valve 1 on the water pipe and separate the existing water tank hose 2. 2. Connect the rubber packing, T-shaped connector, and water tank hose to th