...another issue....glob the sealer on the inside edge of the opening and install the A/C when still sticky ....make the bottom of the seal a gasket and leave the top of the seal loose-just reverse of the factory install....you won't a have any leaks and if necessary you can seal the unite from the inside with whatever you are using for caulk-smoothing it with your finger in a latex glove/or taped with duct tape and removable later without leaving the "black finger"....which is just like "stink finger" only it doesn't wash off with water....geofkaye
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