3a 2nd end thread class 12 1st end thread quantity per inch machined groove in flared ends to accommodate seal rings per KC103 passivate inside surface treated un 1st end thread series
3a 1st end thread class 12 1st end thread quantity per inch machined groove in flared end to accommodate seal ring per KC103 passivate outside surface treated un 1st end thread series
3a 2nd end thread class 20 1st end thread quantity per inch inverted flare ends, black-plasic coated plastic outside surface treated unjs all ends thread series
3a 1st end thread class 12 1st end thread quantity per inch machined groove in flared ends to accommodate seal rings per KC103 passivate outside surface treated un 1st end thread series