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About product and suppliers:
        Alibaba.com offers 237 duck bill valve products. About 53% of these are pipe fittings, 30% are valves. 

A wide variety of duck bill valve options are available to you, such as rubber, stainless steel, and brass. You can also choose from check, butterfly, and pressure reducing. As well as from high pressure, low pressure, and medium pressure. And whether duck bill valve is high temperature, normal temperature, or medium temperature. 

There are 238 duck bill valve suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Pakistan, and Turkey, which supply 99%, 1%, and 1% of duck bill valve respectively. 

Duck bill valve products are most popular in Southeast Asia, Mid East, and Africa. 

You can ensure product safety by selecting from certified suppliers, including 228 with ISO9001, 128 with ISO14001, and 123 with OHSAS18001 certification.