2015DIN EN 4552:2015-09 Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight nipples, welded end - Inch series; German and English version EN 4552:2015
1970DIN EN 4552 E:2015-02 Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight nipples, welded end - Inch series
2015DIN EN 4552:2015 Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight nipples, welded end - Inch series; German and English version EN 4552:2015
2004DIN EN 4552:2004 Aerospace series - Pipe coupling, 37°, spherical, in heat resisting steel - Straight nipples, welded end - Inch series; German and English version EN 4552:2003