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3/8-18 NPT Tap
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3/8" x 18, National Pipe Taper Tap, Carbon Steel, Ideal For Pipe Fittings, Cuts Internal Threads In Piped, Normal Size Of The Tap Is That Of The Pipe Being Fitted, Tapered At A Rate Of 3/4" Per Foot, Use 9/16" Drill Bit, Bulk Pouch.