ANSI B16.5 Class 150 slip-on flange 1.type:WN, SW, SO, BL, ... slip-on flange ANSI flange1.Pressure: Class 150, 300, 600, 900, 1200, 1500, 25002.Size: DN15 – DN12003.Type: WN, SW, SO, BL ... .Surface treatment: Rust-preventative oil, Black painted ANSI B16.5 Class 150 slip-on flange