End number of times I've had to ground my children for carelessly leaving the bath water running, leading to an overspill. Not only is it cardinal wastage of a precious resource but also the additional work of mopping up. A simple gadget like Water&time promises you no more wastage. This intuitive valve screws onto any regular faucet and turns off the water automatically after its timer goes off. You simply need to figure out how long will it take for you to fill up the tub. I think its suitable for the kitchen sink as well, don't you?