Quick answer

Replace a lost GoPro HERO3 or HERO4 standard housing lens cap with a compatible protective lens cap like the Fotodiox Pro GoTough model—it snaps on directly and costs only a few dollars.

Why the standard housing cap matters

The standard housing for HERO3, HERO3+, and HERO4 cameras includes a clear, flat lens cover that seals out dust and moisture while protecting the camera's own lens from scratches. Losing this cap leaves the lens exposed during action shoots, which can lead to permanent damage.

The GoTough Protective Lens Cap is a rigid plastic replacement that fits the standard housing only—not the slim skeleton case for HERO3+ or HERO4. If you have the skeleton case, you'll need a different solution.

What to check before buying

Confirm your housing type: the standard housing has a flat front window and a hinged back door. The slim skeleton case is thinner with open sides. The GoTough cap only fits the standard housing.

Also verify your camera model: HERO3, HERO3+, and HERO4 all use the same standard housing lens cap dimensions, so one cap fits all three in that housing.

Diagnosis and replacement steps

  • Symptom: The lens cap on your GoPro standard housing is missing, cracked, or no longer stays in place.
  • Likely cause: The original cap popped off during a fall, was left behind after a shoot, or became brittle from UV exposure. If the cap cracked, check the housing rim for damage before installing a new one.
  • Corrective action: Purchase a compatible replacement such as the Fotodiox Pro GoTough Protective Lens Cap. Align the cap with the housing front and press firmly until it clicks into place. No tools required. If the cap does not snap on easily, do not force it—stop and verify your housing is the standard version, not the slim skeleton case.
  • When to stop or choose another option: If your housing rim is cracked or warped, a new cap won't seal properly. In that case, replace the entire standard housing instead of just the cap. If you own a HERO3+ or HERO4 slim skeleton case, the GoTough cap will not fit. Look for a cap designed specifically for that case or use a different protective method.

Product facts