Review on Medium Replacement Compatible PetSafe Freedom by Kristin Thomas

After watching videos on the internet I decided I could replace the valve myself. My valve doesn't just slide in and out though, it has screws and a rod inside that you screw into. I had a hard time holding the board in place by screwing in the screws on the other side of the door. A second pair of hands would be nice. Instead, I lay on the floor, spreading the door open, trying to reach both sides at once! I did it, but it took longer than I thought. Also, I find that these flaps don't fit as well as the original. There is a small gap on one side that still lets cold air through.