Chain Knocker, Head Type Chain Knockers, Compatible Cleaner Series M18 FUEL(TM) High Speed Chain Snake, Connection Size 5/16 in, Maximum Drain Line Inside Diameter 3 in, Minimum Drain Line Inside Diameter 3 in, Product Type Standard Chain Knocker, Compatible Cleaner Manufacturer Part Number 2819-22, Cutter Length 3 in, Cutter Type Chain Knocker