Dial Indicators, Micrometers, Calipers manufacturer / supplier in China, offering 1/4-18 NPT Taper Pipe Thread Plug Gauge Includes Multiple Sizes, 1″ -11 1/2 NPT Taper Pipe Thread Plug Gauge for Pipe Fitting Inspection, 1/2-14 NPT Tapered Pipe Thread Plug Gauge Go and Nogo Set with Hardened Tips and so on.