Product Item: ASME B16.5 Blind Flanges
Standard: ASME B16.5
Material: ASTM A105
Size: 20 Inch, DN500
Pressure: Class 300 LB, PN50
Surface: Black Painting
Facing: RF
Source: https://www.landee.cn/asme-b16-5-blind-flanges-astm-a105-20-inch-300-lb-rf.html
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