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Old 01-08-2010, 12:29 PM
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turbodog
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Originally Posted by seaball
here's a quick (but incomplete) synopsis: (and in chronological order)

2991 - 3.9mm wide (mi2ec through mi3.5 kits - oring style)
3221 - 3.9mm wide (slip-on, no o-ring, released for mi3)
3525 - 4.9mm wide (mi4 kit - oring style)
3570 - 3.9mm wide?? (no idea what's different)
U3221 and U3570 are less than 3.9mm, don't have the U3221 in front of me but guessing it's 2.99mm. U3221 is slip on no o-ring/ U3570 has o-ring according to description.
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