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About product and suppliers:
        Alibaba.com offers 125,274 drainage products. About 4% of these are metal building materials, 1% are other plastic building materials, and 1% are cast & forged. 

A wide variety of drainage options are available to you, such as stainless steel, plastic, and zinc. You can also choose from free samples, paid samples. 

There are 123,388 drainage suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Vietnam, and India, which supply 98%, 1%, and 1% of drainage respectively. 

Drainage products are most popular in Domestic Market, North America, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 43,658 with ISO9001, 20,012 with Other, and 11,952 with ISO14001 certification.