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About product and suppliers:
        Alibaba.com offers 997 42mm aluminum cap products. About 8% of these are lids, bottle caps, closures. 

A wide variety of 42mm aluminum cap options are available to you, such as screw cap, pump sprayer, and twist off cap. You can also choose from aluminium-plastic, plastic, and metal. As well as from bottles, jars, and cans. And whether 42mm aluminum cap is non spill, pilfer-proof, or non-refillable. 

There are 918 42mm aluminum cap suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Thailand, and Taiwan, which supply 99%, 1%, and 1% of 42mm aluminum cap respectively. 

2mm aluminum cap products are most popular in North America, Western Europe, and Central America. 

You can ensure product safety by selecting from certified suppliers, including 244 with ISO9001, 38 with Other, and 13 with ISO/TS16949 certification.