Sink Bigger water outlet and space saving toilet tank lid for rectangular tanks larger than 18" and smaller than 20" (by Sink Twice)

outlet Sink Bigger is the largest of our three toilet tank sinks. It operates in such a way as to allow the user to wash hands with clean water, then it flushes with the resulting soapy water, saving water, money, and space. The concept is highly developed and proven in Japan.