GoScope (60M) Red Filter - Compatible with GOPRO HERO4 / HERO3+ / HERO3 Dive HOUSING (60M Case Only) Laser Cut Optical Red Filter {See Pictures to Make Sure This FITS Your Camera CASE} : Electronics - Amazon.com
PolarPro Red Filter for GoPro Hero3 / Hero3+ / Hero4 60m Dive Housing
FLIP7 Three Filter Kit with SHALLOW, DIVE & DEEP Filters for GoPro HERO 7, 6, 5, 4, 3+, 3 - FLIP10
Polar Pro Polarizer Glass Filter for GoPro Hero 3,3+,4 | Bluewater Photo