1'' NPT PLUG GAUGE. NPT general purpose pipe thread plug and ring gauges. we offer a complete line of plug and ring gauges to inspect General Purpose National Taper NPT Pipe Thread from 1/16 ‐ 6.0 inches. Threads made to this specification consist of external taper and internal taper to form a normal type of joint fitting for general application on pipe.

1'' NPT PLUG GAUGE.