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About product and suppliers:
        Alibaba.com offers 8,069,289 union products. About 1% of these are packaging boxes, 1% are bottles, and 1% are pipe fittings. 

A wide variety of union options are available to you, such as stainless steel, carbon steel, and copper. You can also choose from equal, round, and reducing. As well as from welding, male, and female. And whether union is hexagon, or square. 

There are 8,069,641 union suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Pakistan, and India, which supply 99%, 1%, and 1% of union respectively. 

Union products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 1,146,353 with ISO9001, 899,390 with Other, and 168,088 with ISO14001 certification.