Chain Knocker, Head Type Chain Knocker, Compatible Cleaner Series M18 FUEL(TM) High Speed Chain Snake, Connection Size 5/16 in, Maximum Drain Line Inside Diameter 1 1/2 in, Minimum Drain Line Inside Diameter 1 1/4 in, Product Type Carbide Chain Knocker, Compatible Cleaner Manufacturer Part Number 2819-22, Application Grease, Hard Deposits, Cutter Length 1 1/2 in, Cutter Type Chain Knocker