Uniweld’s 40000 Sludge Sucker® is a tool that was developed to clean out a condensate drain line without having to access the drain pan located in the A/C System’s Air Handler. The Sludge Sucker’s clear vinyl hose is attached to the 3/4-Inch PVC condensate drain line on the outside of the building. With the use of Nitrogen, CO2 or water suction is created that pulls all the sludge and algae from the drain pan and drain line; then blows it onto the ground outside. Three Easy Steps: 1.) Locate condensate drain line. 2.) Attach Sludge Sucker vinyl hose to condensate drain line which fits inside a 3/4-Inch PVC fitting. Use PVC fittings, if necessary to attach vinyl hose. 3.) Flow Nitrogen, CO2, or water through the Sludge Sucker and watch the sludge and algae get sucked out of the drain line and blown out onto the ground.