http://www.stebersteel.net/steelfittings-industrialfittings-bwfittings-pipefittings/a403steelfittings-norm-astma403-wp304-stainlesssteel-pipefittings/

ASTM A403 WP304 Elbow Manufacturer: ASTM A403 WP316 Elbows, Long Radius, Schedule 20, 12 Inch (DN300), 45 Degree, 90 Degree,
Usually the ASTM A403 WP304 elbows,tees,reducers are made from steel pipes,the caps are made from plates.But the large sizes pipe fittings are commonly manufactured in pieces and welded together

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