Amazon.com : SOONSUN 3 Pack Dive Filter for GoPro Hero 5 6 7 Black Super Suit Dive Housing - Red,Light Red and Magenta Filter - Enhances Colors for Various Underwater Video and Photography Conditions : Electronics
Amazon.com : PolarPro Magenta Filter for Green Water-Compatible with GoPro Hero3 Standard Housing : Electronics
Underwater Diving Red / Pink / Magenta Filters for GoPro Hero 9/10/11 – QKOO
Amazon.com : PolarPro Magenta Filter for Green Water-Compatible with GoPro Hero3 Standard Housing : Electronics
PolarPro GoPro Hero3 Green Water Filter - Intova Australia Intova Australia
SOONSUN Filter Kit for GoPro Hero 11 10 9 8 Black Magnifier Red Magenta Pink Diving Color Filters for Housing Case Accessories|Camera Filters| - AliExpress