The other review of this skylight is very accurate.I don't understand the lack of a description for this product. It is a good skylight. The quality seems to be about equal, if not better, as the rest of them. I did use the tube of adhesive that came with It. The adhesive does seem to be the same as the Rv manufacturer orginal. It did come off easy compared to the dicor sealant someone added around the edges. It wasn't leaking because of the adhesive, it leaked because of the cracks in the skylight, along the flange. The skylight will need to be replaced again in the future, so the adhesive that came with it, is perfect. Someone will be able to remove it easily, when needed in the future. After, cleaning, I used the old screws to replace it, because nothing was wrong with 5 year old screws. I made new holes, because it is not the same skylight. It fit over the hole about the same as the old one.It has been through severe, bottom falling out storms, since being installed and it don't leak. In my picture you can see the new skylight and the old one. The old one looked like the one on Amazon called tough grade. I was going to say bad things about it, but I though about it and realized, I don't know of any clear plastic products that don't turn brown, dryrot and crack after 5 years. The old skylight is flexible, but didn't seem to hurt the quality. The new one is ridged (firm). I liked the price. I kind of wish, I would have picked out a smoked or white one, so the inside trim don't turn brown from the sun. I picked clear, because it was the same as the original color. The picture on Amazon makes this skylight look like a white one. It is clear with a white protective film on it for shipping/installing.