Dear Scott Brennan,
Thank you for your question. The Delta Angular Modern T27867 and T27967, 3 and 6 Setting Integrated Diverter and Trim, are used when adding handshower, body sprays, or another showerhead. The top handle is the diverter handle, to switch from one or combination of two running at the same time. If you are adding one extra showering unit, you would use the 3 setting and if you are adding two extra showering units you would use the 6 setting.
Date published: 2017-08-16