External Shower Mixer.
The cover of the shower is closed
Insert the swivel on the end of the detachable hose into the fitting.
The hose is now locked into the fitting.
Rotate the handle to start the flow of water.
Adjust the water temperature , left for hotter, right for colder
The shower head has a valve on it to control the flow of water. Press it down with your thumb to start the flow.