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The main difference is the bailout connector where the E model has the oval, rubber encapsulated male/female 9-volt battery looking interface and the F model has the round metal Nexus connector. I'm not the expert here so I don't know of any internal differences.
I was searching for awhile before I ran across these several months ago; not the easiest to find. I bought 5 of them and they sent (3) H-161 E/U and (2) H-161 F/U so they do have a mix of them. Mine were 1990 mg. date so the foam was starting to melt, but they are new in the wrapper : )...
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