WATER-SAVING MIXER TAP
You can use the faucet traditionally but you can also use it to save water: 1. pushes the lever down until it locks : the cold water present in the hot water pipes is quickly directed to an expansion tank. 2. when the hot water reaches the faucet it causes dilation of the thermostatic element that unlocks the lever enabling it to return to the neutral position under the effect of a return spring. 3. the user can lift the lever and have hot water in a conventional manner without wasting any cold water at all.