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About product and suppliers:
        Alibaba.com offers 2,846 stem tube products. About 2% of these are packaging tubes, 1% are steel pipes, and 1% are plastic tubes. 

A wide variety of stem tube options are available to you, such as 16mn, q235, and api j55. You can also choose from structure pipe, fluid pipe, and oil pipe. As well as from ce, api, and iso. And whether stem tube is free samples, or paid samples. 

There are 2,846 stem tube suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of stem tube respectively. 

Stem tube products are most popular in Africa, South America, and North America. 

You can ensure product safety by selecting from certified suppliers, including 690 with ISO9001, 571 with Other, and 146 with GSV certification.