1) Models: DIN2631, 2632, 2633, 2634, 2635, 2636, 2637, 2638 2) Material: RST37.2 (DIN1 DIN Flanges1. Models: DIN2631, 2632, 2633, 2634, 2635, 2636, 2637, 26382.Plate,welding-neck,slip-on,blind,threaded3.Size:DN15-DN25004.Material:S235JR,RST37.2,C22.8 DIN Flanges