I'm converting my bathtub into a bathtub/shower combination. When completed, I will have water going to the tub spout, the main, fixed shower head located above the tub, a rainshower head located at the center of the ceiling above the tub and a handheld shower head assembly.

I'll be using the GrohFlex Universal Rough-In system and the Grohflex Authentic Dual Function Pressure Balance Trim With Control Module between the tub spout and the main, fixed shower head. I'm trying to determine how to get water to the rain shower head and the hand held shower head and how to be able to switch between th0se two showerheads. I will not be using more than one showerhead at a time.

I won't be able to use the free Delta products I received because they will work with only one shower head. I would not be able to switch from the rainshower head to the hand held shower head. Should I buy another rough-in and cartridge/control, feeding it from the water supply lines before the water reaches the the control for the tub/main, fixed shower head, and place it in a different location or can I use a diverter located below the fixed, main shower head? Am I assuming correctly that if I use a dual or triple diverter (I don't know which one I need) attached to the tubing supplying water to my fixed, main shower head I won't need a second rough-in box and dual function cartridge to feed the rainshower head and the hand held shower head? I should then be able to control the tub spout and the three shower heads from one control, the water temperature and volume being adjustable for all of them. Again, only the tub spout or one of the three shower heads will be in use at any given time. Also, it seems that the tub and shower outlets on the GrohFlex rough-in box are the same size so I should not have to install it upside down for increased flow to the shower head. Is my assumption correct or is there something inside the valve that I can't see that sends more water to the shower head, which would explain why both outlets are the same size?


I apologize for my ignorance and I thank you in advance for your time and any assistance provided. I also apologize for the length of my post. I know that many people won't read a post this long.







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because you have chosen grohe, you will have to stay with grohe for a diverter or the trim will not match.
grohe makes a 5 port diverter (2 in 3 out) but I don't see anything that will give you 4 out.
gonna have to do some head scratching on this set-up.

If the standard shower head and the hand-held are on the same line, and have on-off switches on each, it would work. I've also seen hand-held that sit in a cradle and function as a standard shower.