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About product and suppliers:
        Alibaba.com offers 685 reputable mediums products. About 36% of these are valves, 1% are injection & puncture instrument. 

A wide variety of reputable mediums options are available to you, such as free samples. 

There are 685 reputable mediums suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of reputable mediums respectively. 

Reputable mediums products are most popular in Eastern Europe, North America, and Southern Europe. 

You can ensure product safety by selecting from certified suppliers, including 685 with ISO9001, 34 with Other, and 15 with ISO14001 certification.