Clemco blast hose. The Hollo-Blast is inserted into the pipe, the Clemco blast machine is started and the Hollo-Blast is manually pushed through the pipe. Abrasive hits the tungsten carbide deflector tip and fans out to clean the 360 degree interior. Air will blow spent abrasive and contaminants out of the pipe. The rate of cleaning depends on deposits being removed. Hollo-Blast is available with 1/2 inch or 5/8 inch nozzles. Standard HB-1 delivered with 1/2 inch nozzle. Air consumption, 1/2 inch 200 CFM, 5/8 inch 350 CFM.