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Factory price wholesale seamless pipe fitting coupling astm a53 grade b with manufacturer
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DIN, BS, JIS, API, ASTM, GB
DIN EN 10216-1-2004, DIN EN 10217-1-2005, DIN EN 10305, BS 1387, BS 31, JIS G3452-2004, JIS G3465-2006, API 5CT, API 5L, ASTM A106-2006, ASTM A53-2007, GB/T 8163-1999, GB/T 8162-1999, GB/T8162, GB/T8163