There a is pedal that is installed near the basin, when you pump the pedal - you have water in the tap. Its costs Rs 650/- (including installtion). We installed one at home in the common bathroom - and the kids loved it. Initially there were some leaks setting it up but the water miser staff was very prompt and fixed it. I think there is water saving - especially when we soap our hands and wash it/kids brush etc A pic of our home installation attached. You can contact Chetan (9620483436) for more details. He actually comes around and does the installation too.You are also most welcome to come and take a look at our home installation. Is anybody aware of any other vendor for a similar product ?