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About product and suppliers:
        Alibaba.com offers 6,500 30mm oil cap products. About 4% of these are bottles, 1% are lids, bottle caps, closures, and 1% are preforms. 

A wide variety of 30mm oil cap options are available to you, such as aluminum, plastic, and metal. You can also choose from screw cap, pump sprayer, and bottle stopper. As well as from bottles, jars, and cans. And whether 30mm oil cap is pilfer-proof, non spill, or child-proof. 

There are 6,517 30mm oil cap suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Vietnam, which supply 99%, 1%, and 1% of 30mm oil cap respectively. 

0mm oil cap products are most popular in Mid East, South America, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 6,072 with ISO9001, 973 with Other, and 443 with ISO14001 certification.