plumbing supplies for water treatment, namely, brine values, slotted risers, tank heads, adapters, closures, reducers, vacuum breakers, pressure vessels, and 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