The port cover is a clip fitting mechanism. The clipping ensures that the polymer material used as the gasket produce a good seal. Since the internal side of the galaxy s5 device is designed for the clip fitting mechanism, I am afraid you won't be able to replace the port cover with another design that would be superior in function.
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ya but there is a handful of third party brands making this cover, I'm just wondering if any of them close tighter than the stock one. maybe mines just no good and getting a stock replacement would fix my issue.