UNE-EN 4557:2003 Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Tees nipples, welded end - Inch series (Endorsed by AENOR in April of 2003.)
2003UNE-EN 4557:2003 Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Tees nipples, welded end - Inch series (Endorsed by AENOR in April of 2003.)