4 way water tap commections

[admin]

It looks all four get some water pressure in equal but a less to next tap. The first tap where hose connected from main line will release high pressure and next would be low and then the third one too and fourth one would be the lowest from all these taps.

This is very true, but this system can be applied where you need multiple lines within a short range, but automatic taps would be best than manual taps. The tap is great and you can use drip lines for your need.
The tap mouth looks it is not suitable for 16mm lateral pipe, please check the diameter and buy it else it will go waste.