... .certificate : ISO large diameter stainless steel forged flange class150/300/600/900 size1/2"-48"TypeLap-Joint Flange (LJ), Socket-welded ... (TH), etc.American SeriesCLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900, CLASS 1500, CLASS 2500European SeriesPN 2.5, PN ... :2000 strictly. large diameter stainless steel forged flange class150/300/600/900