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Mathey Dearman Nylon Expanding Pipe Stopper 3" - NES75 Work Clamps Many entry-level "flux core" machinesMathey Dearman Nylon Expanding Pipe Stopper 3" NES75 The Mathey Dearman Nylon Expanding Pipe Stopper 3" NES75 is a highly effective and durable solution for sealing pipes during various maintenance and welding tasks. Constructed from strong nylon, this stopper expands to securely fit 3" diameter pipes, providing an airtight seal that prevents leaks during pressure testing or welding procedures. Easy to install and remove, the NES75 is reusable,