I used 2 of these to secure the plumbing access panel at the front of our master bath jacuzzi. It took me awhile to figure out why the latching mechanism wouldn't catch when I mounted it on the left side of a 2x4" board that is part of the front frame surrounding the jacuzzi but works when mounted to the rigth side. It worked fine when not mounted but not when mounted. I took one apart to see how it operates. There is a plastic round piece that rotates in a hole in one side of the housing. The other end of the piece has a X shape that catches on the frame when latched in place. There is just enough play where the X shape was falling away from the catch on the frame. When I mounted it on the right side, it would fall towards the catch and engage every time. It has a fairly narrow caulk width, so without the caulk the gap around the access panel is not that noticable and makes for quick access if ever needed.
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