11 Plumbing supplies for water treatment, namely, brine valves, slotted risers, tank heads, adapters, closures, reducers, vacuum breakers, [ pressure vessels, and water storage tanks; water softening units, water filtering units for domestic, commercial, and industrial use; units for the production of drinking water, namely, ultraviolet (UV) sterilizers, reverse osmosis units, and filtration units, ] all for domestic, commercial, and industrial use