Used to retrofit a drain tee into the toilet tank   to prevent backflow caused by high water pressure in the toilet

Suitable for the white corrugated drain pipe shown in the diagram (commonly available at hardware and bathroom supply stores)

The correct installation method is illustrated in the figure   Note that, due to the need for high drainage capacity, this design does not rely on magnetic or anti-gravity principles

Please ensure the closing direction is aligned with gravity, pointing downward

Additionally, if the entire assembly is fully inserted into the pipe, it will restrict the opening angle and reduce the flow rate; adjust accordingly based on specific conditions

The actual water-blocking performance is satisfactory