Robust, durable and flexible polypropylene lock rod drain rod. Superior interlocking fittings enable rods to be rotated in either direction and will remain securely attached. Knurled screw connectors for enhanced grip and tool-free connection. Use as spare or extension for the Silverline Lock Rod Drain Rod System (278373). Robust, durable and flexible polypropylene lock rod drain rod. Superior interlocking fittings enable rods to be rotated in either direction and will remain securely attached. Knurled screw connectors for enhanced grip and tool-free connection. Use as spare or extension for the Silverline Lock Rod Drain Rod System (278373).