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Amazon.com: HORUSDY 6-Piece NPT Pipe Tap Set, Sizes Includes 1/8", 1/4", 3/8", 1/2", 3/4" and 1" : Industrial & Scientific
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XtremeAmazing Set of 5 HSS NPT Pipe Tap Set 1/8, 1/4, 3/8, 1/2 and 3/4 Inch: Amazon.com: Industrial & Scientific
RIDGID, 1/8"-27 Thread Size, 3/4 in Thread Lg, Pipe and Conduit Thread Tap - 38HY54|E-5112 - Grainger
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1-8 Complete Helical Thread Repair Kit - Includes Helical Insert, HSS Drill Bit, STI Plug Tap & Installation Tool
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