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        Alibaba.com offers 5,075 18 21 tube products. About 1% of these are steel pipes, 1% are led tube lights, and 1% are plastic tubes. A wide variety of 18 21 tube options are available to you, such as api, bsi, and ce. You can also choose from plastic, pvc. As well as from a135-a, api j55, and 10#. And whether 18 21 tube is structure pipe, gas pipe, or boiler pipe. There are 5,091 18 21 tube suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Vietnam, and Taiwan, which supply 99%, 1%, and 1% of 18 21 tube respectively. 8 21 tube products are most popular in Mid East, Africa, and Eastern Europe. You can ensure product safety by selecting from certified suppliers, including 969 with ISO9001, 189 with Other, and 86 with ISO/TS16949 certification.
        
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