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About product and suppliers:
        Alibaba.com offers 777 drainage grid products. About 34% of these are metal building materials, 9% are other earthwork products, and 5% are cast & forged. 

A wide variety of drainage grid options are available to you, such as free samples, paid samples. 

There are 780 drainage grid suppliers, mainly located in Asia. The top supplying countries are China (Mainland), United Kingdom, and Bulgaria, which supply 99%, 1%, and 1% of drainage grid respectively. 

Drainage grid products are most popular in Southeast Asia, Mid East, and South America. 

You can ensure product safety by selecting from certified suppliers, including 525 with ISO9001, 159 with ISO14001, and 102 with Other certification.