Grey color is 3 way junction with big pipe in, 2 small pipes out.
Red is 2 way junction with small pipe in and small pipe out.
Brown is 3 way junction with big pipe in, 1 big pipe and 1 small pipe out.
Green is 2 way junction with big pipe in and small pipe out.
The question is at the thick pipe on the left.
Both A and B are shower heads.
I need to know if both shower at the same time, which layout is better? As in the water won't be so little.
Thanks for the help.