Used where the water pipe enters the room to allow for easy shut-off of water flow to the end fixture, allowing for maintenance and repair without having to turn water off to the entire home. Typically used on stub-outs coming out of the floor. Certified for use in potable water systems. Warning: This product can expose you to chemics including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov. -