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About product and suppliers:
        Alibaba.com offers 2,830 pipe standard outer diameter products. such as free samples, paid samples. 

There are 2,837 pipe standard outer diameter suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Japan, and India, which supply 98%, 1%, and 1% of pipe standard outer diameter respectively. 

Pipe standard outer diameter products are most popular in Southeast Asia, Mid East, and North America. 

You can ensure product safety by selecting from certified suppliers, including 631 with ISO9001, 252 with Other, and 50 with ISO/TS16949 certification.
        
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