(1) Compatibility of flushing device: A quantitative flushing device that is compatible with the toilet and meets the functional requirements must be equipped, and its overall sealing should be ensured. The matching flushing device should have anti siphon function.
  
(2) Toilet seat ring and cover compatibility: A seat ring and cover that matches the grade of the toilet should be equipped for use.
  
(3) Sealing requirement for connection: The connection installation between the product and the water supply and drainage system should be maintained for 15 minutes without leakage under a hydrostatic pressure of not less than 0.10 MPa.