SOLENOID COIL ON TRITON T80Z
No it is not necessary to turn the water off however it isadvisable in case you have a faulty valve.
See the video at the foot of this page
http://www.showerdoc.com/solenoid-coil-universal-no-valve-hydr-27600
Answered 9 years ago by The Shower Doctor
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Hydra Universal Electric Shower Solenoid Coil (no valve included) - 27600
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