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Amazon.com: 5 Piece NPT Thread Forming Taps, Pipe Taps Set, High-speed Steel Drill Bits for Cleaning or Re-thread Damaged or Jam Pipe Threads, Size 1/8", 1/4", 3/8", 1/2", 3/4" in Storage Box :
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Amazon.com: QWORK 1/2" - 14 NPT Pipe Tap, Carbon Steel, for Clean and Re-thread Damaged or Jam Pipe Threads : Industrial & Scientific
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Amazon.com: Metric Tap/Threading/Rethreader Rethreading Tool M2.5 - M12 9PC BERGEN AT591 : Industrial & Scientific
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3/4" Carbon Steel NPT Tap and 59/64" HSS Drill Bit Kit, Qualtech | POU3/4NPTW/DRILL | DrillsandCutters.com
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