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Simple, straightforward and low shipping rates for these flow control valves.
Q. "Why don't these shower head volume controls completely shut off water flow from my shower head?"
A. The flow control valves (included) are intentionally designed to not be able to shut off completely. This is done for safety reasons. Consider if you shut both valves off completely at the heads (rather than shutting off the shower valve). You then would have the hot and cold water both on at the same time - connected. That means that which ever side has more pressure would then push itself (either the cold going into the hot line or the hot going into the cold side). That means that there now is a potential to get completely all hot water coming out of cold sides of valves. Including when you turn the valves back on at these shower heads. All hot water could come out and that could scald you. To help prevent potential scalding the volume control valves won't shut off completely.
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