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product name:Butt-welding Pipe Fittings Caps Butt-welding Stainless Steel ASTM A403 WP321H Sch80 ASME B16.9 Size:1/2"-68"DN15-DN1800 Wall thickness:Sch5-Sch160XXS Standard: ASTM, ASME , DIN ,JIS,API ...