Hi,
I am laying out the master bath shower (see attached image). I have a thermostatic mixer (k-679) and plan to purchase 1 volume control (k-671-k) and one 3-way diverter (k-687-k).
There will be one handheld showerhead, one fixed showerhead and one tub spout. See rough sketch below.
Will one volume control work for all of this? The Kohler sample layouts always show multiple volume controls with the k-669 thermostatic mixer and I am not sure if they are required or just trying to sell more volume controls.

(Slab construction - the hot and cold water are actually coming down from the attic!)

Thanks,
Mary

H C Shower Head
| | |
| | |
| | |
| | |
| | |
K-669-KS or Mixer |
K-679-KS | |
| | Hand Held
K-671-K or Volume | |
K-681-K | Control | |
| | |
K-687-K Diverter | |
(3-way valve)|-------|
|
|
Tub Spout

Enclosed is typical layout for 3-outlet set up... Best system for multi shower set ups is Grohe, Hans Grohe and Kohler. See enclosed drawing...

You will need an experienced plumber to rough it in for you.

Let me know how you did... Good luck... Milo