The tool is mounted on 3/8 inch pipe lance for the length of tubing to be cleaned. A tungsten carbide lined reducer adapts the 3/8 inch lance to standard straight 1-1/4 inch thread for attachment to blast machine hose. Operation of the Hollo-Blast Jr. is the same as Hollo-Blast. Air consumption is 80 CFM. Recommended abrasive size is 30 mesh or finer.