Medium Opening Tool Head Type Opening Tool Compatible Cleaner Series M18 Sectional Machines Connection Size 7/8 in Maximum Drain Line Inside Diameter 8 in Minimum Drain Line Inside Diameter 4 in Product Type Cutters Compatible Cleaner Manufacturer Part Number 2818-20 2871-20 Application Sectional Machine Cables Compatible Cable Core Type Open Wind Compatible Cleaner Grainger Part Number 55NJ55 Cutter Type Opening Tool Features RUST GUARD Plating For Use With 55NJ55 Material Steel