Feature 1Automatic Opening: Special reducer loop design, suitable for most hoods, just open the check valve, through the exhaust wind, automatically open the smoke exhaust. 2Firmly Block: When the check valve closes, it closes by gravity and its own spring, firmly blocking the outdoor odor and bugs. 3Slant Gravity Sealing: The check valve has a slant gravity sealing for grease and smoke not to back up, stainless steel strong spring, fast sealing after exhausting smoke, silicone sealing ring. 4Close Fit: Check valve can be a close fit, leaving no gaps, back plate sealing strip, stick to the wall without leakage. 5Quick Installation: Check valve with level design, installation in one step, the main body and fixed seating can be detached and separated, installation is faster and more convenient.Item Type: Check valveMaterial: ABS, stainless steel, siliconeSuitable for Pipe Diameter: Approx. 150-180mm/5.9in-7.1in .wang-edit-text{ font-family:"Arial" important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Check Valve2 x Band1 xSteel RodNoteManual measurement may have error. Please make sure you don"t mind before ordering. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin