Completely forgot my TBI test fittings came in from Jeg's a few days ago. Just opened the package to get some pics and compare them to the Actron setup.
Jeg's had them listed under the brand OEMTOOLS but the bags they came packed in are labeled Great Neck Saw Mfg
with the same part #. One thing I noticed right away is they have a snap ring retainer at the swivel portion, instead of just a simple lock ring you would have to pick at on the Actron part.
Next difference I noticed is the ID of the outlet is slightly smaller, and there are a few other minor differences in appearance. They're intended to be the same part but they are definitely not made exactly the same. I suspect the OEMTOOLS one might be easier to disassemble in the event you need to service it; I'd bet there's probably an O-ring or two inside the swivel portion.
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OEMTOOLS/Great Neck on the left, Actron on the right.
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Either way I don't think you can go wrong. I've used the Actron fitting in the past and the OEMTOOLS looks functionally the same.
Richard