Drain King® 186 Drain Opener for 1-1/2" to 3" Pipe Diameter, 50-80 PSIFor kitchen & bathroom drains, washing machine drains and most interior applications. Water dispersing valve turns water into pulsating jets to clear a drain up to 1,000 ft. Works with standard water pressure (50 80 PSI). Eliminates the need to use possibly caustic and poisonous chemicals. Environmentally safe, safe and easy to use over and over again. 1 1 2" to 3" diameter Attaches to garden hose Environmentally safe, safe and easy to use over and