Ridgid 37875 Manual Pipe Threader Die, High Speed, Right Hand, 3/4-Inch 3/4" Nominal Pipe Size 14 Threads Per Inch (NPT) National Pipe Taper Used for OO-R, 111-R, 12-R, O-R, 11-R Ratchet threaders Also used for 30A, 31A 3-way pipe threaders