The W.A.T.E.R. project team realized that behavioural changes only would not be able to reduce the water consumption but need effective and cheap water saving device. Thimbles (in Figure) are button like structures that can be fixed at aerators or showers, and easy to be fixed that not need any plumbing works. In Malaysia, thimbles also already started to be promoted by PBA in Penang, SAJ in Johor and latest is Air Selangor in Selangor. Thimbles with the following advantages selected as water saving device (WSD) to be given to communities as part of water conservation initiatives.

1. The thimbles is an easy and non-burdening preparatory water saving device for Malaysians to carry out their household chores with controlled water flow.
2. The thimbles does not require major plumbing works and changes in water faucets. It is easy to fix by just following the instructions and wide range of audience can use it upon distribution. Thus, the thimbles can easily reach larger target groups.
3. The thimbles is economically practical to reach overall Malaysian population

Thimbles were proven to assist in reducing water consumption in Singapore. But, there was no local data or publicly available data to support the effectiveness of thimbles. Therefore, W.A.T.E.R. project took the challenge by introducing thimbles to communities in Selangor at selected river basins and quantify the water reduction due to thimbles.