Featured with single or double head motion pattern, this Foot Opt Valve can endure 60 degree C operating temperature. Its port size is ¼ inch and it can handle 40micron filtered air. It is used as essential part of horizontal pipeline to prevent backward flow of specific media. This valve is also effective in filtration of impurities having large particle size. Standard of this Foot Opt Valve has been verified on the basis of its design precision, mechanism, performance, service life and strength.