Gec protection

[nickelec]

Hi all, I have a #6 gec running to my water main that is protected by a piece of ferrous RGS that is bonded at both ends my question is as follows.
Can I use a compression fitting or does it have to threaded do attach my migb?

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[nickelec]

Seems code compliant to me according to 250.64 (e) does anyone agree or disagree?

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