Yes, this piece is designed to replace an existing shower arm. You will still need to use your shower faucet to turn the water on and off, but the handle on this piece will allow you to switch from the shower head to the hand shower.
I have now been with the company 4 years, I know which fixture works best for your lifestyle. In addition to this knowledge, I’m a woodsman, hunter, and overall outdoorsman.
While this system comes complete to divert the water to the handheld or the overhead, you would need to have a way to turn the water on. If you follow the link here you can choose from the different Pressure Balance Trim or Thermostatic Mixing Trim with Volume Control's plus their valves.
The distance from the mixer handle to the top of the shower is 30.5". The showerhead is 4.56" down from the top of the shower bar.