For 1-1/2 inches to 3 inches drains (38 mm - 76 mm). Unclog drain pipes quickly and easily: Fast: Just attach to a hose, place in the drain and turn on the cold water! Economical: Eliminates the need for a service call, and its reusable! Chemical-free: Requires no harsh or toxic chemicals just water! Clog Buster uses cold water under pressure to clear drains quickly and safety. Position Clog Buster in drain. Clogs simply wash away! Clog Buster for 1-1/2 inches to 3 inches drains in sinks, bathtubs, showers, washing machines and pools. Limited 3-year warranty (See enclosed instruction sheet for full warranty details). Oatey.com/Harvey. Made in USA of US and foreign components.