Is any one of a special class of devices or equipment that is intended to perform a special plumbing function. its operation and/or control may be dependent upon one or more energized components, such as motors, controls, heating elements, or pressure or temperature-sensing elements. such device or equipment may operate automatically through one or more of the following actions: a time cycle, a temperature range, a pressure range, a pressure range, a measured volume or weight; or the device or equipment may be manually adjusted or controlled by the user or operator.