On May 2, 7:59*am, "don &/or Lucille"
wrote:
if you do put a shutoff in the shower head then it is possible to have the
hot water bypass into your cold water wrote in message


....and vise-versa. It will flow in the direction of the draw. Hot
demand elsewhere will draw from the cold side where it normally would
be mixed in the shower between the valves. Some valves prevent this
from happening (one-way only).

bob