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696 non return valve sizes products are offered for sale by suppliers on Alibaba.com, of which check valves accounts for 56%, other valves accounts for 7%, and pressure reducing valves accounts for 2%. A wide variety of non return valve sizes 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 non return valve sizes,as well as from black, white, and silver non return valve sizes,And whether non return valve sizes is ball float, {2}, or {3}.