182 flap valve 4 inch products are offered for sale by suppliers on Alibaba.com, of which check valves accounts for 56%, gate valves accounts for 10%, and ball valves accounts for 2%.
A wide variety of flap valve 4 inch options are available to you, such as pressure, manual and hydraulic.You can also choose from normal temperature, medium temperature and high temperature flap valve 4 inch,as well as from water, gas, and oil flap valve 4 inch, and whether flap valve 4 inch is steel, stainless steel, or iron.