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Credibility ,Sloper and reducing tee for standard parts, usually outside diameter are Ⅰ series and Ⅱ series, if nominal dimension for DN150x100, outer diameter for Ⅰ series, the wall thickness of grade Sch20, material for 20 # concentric sloper mark it as DN150x100 Ⅰ Sch20-20 R (C) GB/T12459. According to GB/butt welding tee T12459 logo, such as DN100X100X80. According to GB/socket welding tee T14383 identifier, such as DN20X15.
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