Final answer:
Water-efficient and high-performing fixtures, such as WaterSense products, are used in LEED buildings to promote water efficiency.
Step-by-step explanation:
In LEED buildings, fixtures that are used to identify are both water efficient and high performing. For example, WaterSense products such as high-efficiency toilets (HETs) and bathroom sink faucets are used to promote water efficiency. These fixtures have been tested and certified to meet EPA's specifications for water efficiency.