Extension Spring for Drain Cleaner Enlarged View This is a single extension spring for the Sanei "Drain Cleaner Long" (model number: PR850) for extending the drain cleaner. It allows for extensions up to 20 meters. The spring length is 850mm. Includes a set of joints and bolts for connection. Installation Instructions Enlarged View How to Extend the Cleaner 1. Overlap the ends of the two extension springs on the joint and align the holes. 2. Securely fasten the overlapping springs and joint with bolts. Tighten firmly using the dedicated spanner included with the PR850. When using... Ensure all connections are securely attached and confirmed before use. Not for use with weak pipes such as vinyl hoses. After use, wash thoroughly and dry completely before storing.