- Valvesandgauges.NPTtaperedtubethreadgaugesThetestisperformedwithgauges.Steelconduitthread;threadgauges,"go"and"notgo"threadpluggauges.Allgaugesandtestequipmentshavevalidcalibrations.Againstothergauges,however,thegreenbackmaystillbeovervalued.Main...
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