They have an open space on the edges of the valve. They are also difficult to install. You need to put your finger with the nut in the small slot at the top of the door opening, then line up the bolt and screw the bolt in at the back. I used a piece of tape wrapped around my pinky, sticky side out. Then I taped the nut to the tape and placed it on the hole. I have medium-sized women's hands and the little finger hardly fits. Also, you often drop the nut and hopefully you're not on deck and it falls into a crack and you have to go below deck to get it because you only got two. Also, holes were drilled into the indigo, but they didn't remove the big blob of plastic burr. And it won't break. I had to get a office knife and cut it. This is a difficult matter, not an easy task. Be careful not to cut yourself. It's solid plastic, but it's just a piece of plastic with a few holes and a few small screws, pretty pricey for something that doesn't really look like it was made for this kennel. When it wears out or it gets too drafty this winter due to a poor fit, I just cut a slightly larger piece of tarp and use that. The dogs were a bit suspicious at first but they're using it now.
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