Fotodiox Pro WonderPana Go H3+ / H4 Filter Adapter - GoTough Filter Adapter System for the GoPro HERO3+ and HERO4 Skeleton Housing Case Simple installation of all-metal WonderPanaGo filter adapter onto GoPro case All-metal adapter screws on for a solid mount, your case remains water tight! Adapter does not interfere with normal function of the camera or the case Premium glass filters screw on for a solid fit 24-Month Manufacturer Warranty