sound like you are talking about the simple adapter. I call it a hockey puck.
https://www.homedepot.com/p/Eaton-30...B&gclsrc=aw.ds
I had one my dad gave me...some garage sale find. Never used it though.
My understanding is that they have a larger tendency to overheat than the dogbone adapters do. Seems plausible to be given that there are a lot of connections potentially in such a small space. I'm pretty sure the one I had looks like it may have gotten a bit hot....
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