Just attach to garden hose and slide Drain Flusher into drain. Water expands Flusher to size of pipe. Then water pressure pushes stoppage down the line. Equipped with back-flow preventer on the inlet side. Made of tough reinforced nylon to resist punctures. Far more durable than rubber. Narrow profile and internal flat spring help work Drain Flusher around bends. Blister packed on three-color cards.
