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3987 1 non return valve products are offered for sale by suppliers on Alibaba.com, of which check valves accounts for 64%, other valves accounts for 4%, and ball valves accounts for 2%. A wide variety of 1 non return valve options are available to you, such as normal temperature, medium temperature and high temperature.You can also choose from stainless steel, alloy and aluminum alloy 1 non return valve,as well as from black, white, and silver 1 non return valve,And whether 1 non return valve is screw, {2}, or {3}.