SANDMARC Aqua Filter for GoPro Hero 4 and 3+ Cameras - Dive, Scuba and – NineCentral - United States
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4pcs Yellow Red Purple Grey Underwater Diving Filter for GoPro Hero 4 3+ New | eBay
SANDMARC Aqua Filter for GoPro Hero 4 and 3+ Cameras - Dive, Scuba and – NineCentral - United States
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Diving Lens Filter Kit Compatible with GoPro Hero 4 Hero+ Hero and 3+ fits Standard Waterproof Housing Enhances Colors for Underwater Video and Photography Includes 5 Filters - Newegg.com