The Osmo Action Multifunctional Charging Handle is not waterproof and should not be used underwater. It is compatible with the Osmo Action 5 Pro and the Osmo Action 4, but there is no information about compatibility with the Osmo Action 3.

No, this handle does not fit the Osmo Action 6. The available information only lists compatibility with Osmo Action 5 Pro and Osmo Action 4. There is no confirmation for the Action 6 in the manufacturer's information. I am not completely sure as the data does not clearly cover this situation. Check our Community for more info.

Yes, it fits Action 3-5, but it is not compatible with Action 2