Hi guys... this might not be 100 % related to this topic, but I would like to ask here since it was related to water pressure

I am planning to install a waterpump for my new house, but came across this "valve" in Mudah



http://www.mudah.my/Tambahkan+Tekanan+bagi...h+-23925360.htm


How true is this ?? it claim that you do not need to install any pump. just use this valve and the water pressure will increase.

Thank You