flowstop by bernd voellinger from germany
designer's own words:
Often water is running when people brush their teeth or have a shave. »flowstop« is attached to your single lever bath tap. After you used the tap it moves the lever back into its original position. As a visual signal it helps you avoid wasting water you do not need. If you want to wash your hands you just take »flowstop« off the lever. »flowstop« is made of rubber and is available in several different colours. With »flowstop« you can reduce water comsumption by 1,000 litres per person per year.
how to use