Have (2) Pegasus single handle shower heads (875-9196). One is plumbed into the hot and cold, works fine. Second one I "envisioned" plumbing a "T" out the shower line of the first, over to the hot side of the second, and when you wanted the second head on, just turn the handle. Water is getting over to the second mixing valve but it is not allowing water to come out. No debris in the way - - played with the anti-scald. . No avail.
Suggestions??