Here is a photo of the 3 different adapters, left to right are Mares, Zeagle, and Scubapro. Note how the width of the outer ring with the 8 spokes varies by style, making it easy to visually identify the different versions. Also, there is a small "Z" or "S" embossed inside that outer channel for the Zeagle and Scubapro versions.Eek think I may have tossed the package, would it be on the adapter itself anywhere?
But correct thread is more than just the diameter, so if Zeagle has changed their fittings it is always possible that the adapter fits only one version. If so, my money is on this fitting an earlier version. You will need a Zeagle SME to weigh in on whether or not there have been any changes. Let us know what you find. If there is a new version I will drop a note to Aqualung, but if it is a standard used only by Zeagle and not by several different (and larger) brands, there would be little chance of interest in creating another variation.