This is nothing but a nice clean seal line. I can tell exactly what it is. This is a thin piece of plastic that needs to be folded in half and glued on the other side. I was going to say "garbage" because that's where it ended up. But I wanted to give a precise description. If you're reading this I think it's just another one star review. If it's still interesting, be careful when cutting to length, you should leave the excess to shrink. That's what it says on the box and when I put it in I left some, but apparently not enough. it's shrunk another half inch on both sides, which begs the question, how good is the glue if it moves half an inch? Does it really shut water out of the crack? I would say save your money. You might even get yourself a caulking tool.
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