Fits perfectly on my Akaso cap and never leaks even after several hours of snorkeling throughout the cruise. The only issue I had, and the reason it got 4 stars instead of 5, is that the hinge pivot pin rusts. I will contact the manufacturer and see what I can do about it. This is clearly not stainless steel, which would have solved the whole problem from the start. I also rinsed it very well with clean water after every salt water dive. Immediately if I could. I don't think this would be an issue anywhere other than in salt water. It will be a 5 star product if you use it in fresh water or on land. Basically I bought this product because for some reason Akaso sold me a body with a round bezel around the lens. I needed this square housing for the red filter. In this respect he has done an excellent job. The red filter never came off. Here is the link to the filter if anyone is interested: YEHOLDING Red Color Correction Snap-On Underwater Camera Lens Filter Kits (3pcs Different Sizes) for GoPro Hero 5, Hero 4 Hero 3+, Hero3 SJ4000 Action Diving Camera
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