Clears all household drains with 3/4" to 4" pipes. Environmentally safe. Uses water pressure to unclog: Sinks, tubs, showers, and other drains. Size: 3/4" to 4" This product can expose you to chemicals including Isoprene which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov. -