A non-positive shutoff valve feature is required when a detachable shower spray head is installed in a bathing room designed for use by individuals with disabilities. A non-positive shutoff within the detachable spray shower head allows for a small flow of clean/potable water through the detachable spray shower head even when the ON/OFF switch for the detachable head is in the OFF position. This flow of water prevents the backflow of brown water into the plumbing system.
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