The only measurable difference is the cross sectional diameter of the O-rings. The result is that one M-C4 to Amphenol connection is loose and the other is very tight. I don't recall which )-ring is smaller but the loose fit could allow moisture in.
Jim Duncan
North Texas Renewable Energy [retired]
On Oct 14, 2016, at 5:26 PM, RE Ellison <[email protected]> wrote:

I have a bunch of panels here to put in with an Amphenol H4 connector
Seems like I remember some issues connecting some of the other connectors to 
the MC 4's

Do these hook up with the MC 4's without any issues or do I need to find some 
of the H4 connectors to use ?

Thanks,
Bob Ellison
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