The Breather Valve is design for enclosure, container transit cases and similar application where requires a manual vacuum pressure relief during pressure change cause by temperature change, height change. The container is hard to open under a vacuum differentials and residual pressure conditions. With Milvent Vacuum Pressure Relief Valve, it will become easy to open container. The valve can be used for volume up to 33 cubic feet. The valve is robust, lightweight, temper-proof and requires no field maintenance. The valve use corrosion-resistant material. The seal of valve is made of silicone rubber. RFI/EMI shielding is available and gasket, hex nuts is available for selection.