I bought this to put on an old Hero 5 that didn't have a door when I bought it. It fits well and I haven't had any problems so far. I use a GoPro camera attached to a motorcycle helmet; I don't need it to be 100% waterproof and I don't plan on submerging it in water so I can't comment on that. However, I got caught in the rain with my motorcycle and had no problems.
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