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Butt-welding Pipe Fittings Butt-welding BL flange ASTM A403/A403M WP316L/WP316H 1/2’’—60’’ ASME B16.9 Description: Steel Flange, Compact Flanges 1/2Inch - 48Inch And 150# To 2500# With A182 / F51 / ...