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WN ГОСТ 12821-80 Flange GOST 33259 GOST12820 ГОСТ 12820 CT20 PN10 PN16 PN25 GOST FLANGE: Size range: DN15 to DN 2000 Design : plate falnge 12820-80, welding neck flange 12821-80 Pressure: PN6, PN10, ...