Nicholas, The auto air vents typically are left in the open position to allow them to automatically remove are as needed. If you close this you will lose the benefit of the auto air removal. If they are concerned with possible leaking or its installed in a location where this is a concern you can add our Hygroscopic safety vent cap, part number R596881. This safety caps has hygroscopic discs that swell up when they contact water and stop the flow of water. When they dry the will shrink and allow air to be removed.
Nicholas, The auto air vents typically are left in the open position to allow them to automatically remove are as needed. If you close this you will lose the benefit of the auto air removal. If they are concerned with possible leaking or its installed in a location where this is a concern you can add our Hygroscopic safety vent cap, part number R596881. This safety caps has hygroscopic discs that swell up when they contact water and stop the flow of water. When they dry the will shrink and allow air to be removed.