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About product and suppliers:
        Alibaba.com offers 2,718 pipe standard outer diameter products. such as free samples, paid samples. 

There are 2,756 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 North America, Southeast Asia, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 779 with ISO9001, 231 with Other, and 61 with ISO14001 certification.