Uniweld 40077 Sludge Blaster Accessory Kit The Nitrogen Sludge Blaster Accessory Kit was specifically designed for multiple uses in the HVAC/R and Maintenance Industry With the use of Nitrogen, CO2 or water the Sludge Blaster expands inside the pipe and blast the clog and sludge free from the drain line Clears condensate drain lines of sludge and algae in seconds Attaches to Uniweld Part No H2SSM 2-Feet Service Hose or Part No H5SMY 5-Feet Service Hose