3a 2nd end thread class fitting shall be polytetrafluoroethylene coated on interal surface only to a distance of 0.220 min 0.270 max in. deep passivate surface treated unjf 2nd end thread series
2a 2nd end thread class 14 1st end thread quantity per inch second end has a groove at end before threads passivate surface treated un 2nd end bulkhead thread series