The King Cobra water jetter gives 5000 psi actual working pressure. The jetter propels a highly flexible and lightweight hose through the drain - blasting through tree roots, sludge, soap, grease, and sediment blockages. As the hose is pulled back, it power scrubs the line flushing debris away and restoring drain lines to their full, free-flowing capacity - all without the use of harmful chemicals. It jets 1 1/2" to 8" (40-200mm) drain lines which allows it to handle domestic houses and large commercial and industrial applications.