This connector is for 2 AWG solid, and has a 0.91 in (23 mm) O.D.
The 3M™ Connector CI-22A is used with molded rubber splices 3M™ 5420 Series and 3M™ 5450 Series. It has a connector O.D. of 0.91 inch and a minimum order case quantity of 10 each.
3M CI Series Connectors up to 35kV - Product Selection Guide (PDF 8.0 K)
3M CI-A Series Connectors up to 35kV - Product Selection Guide (PDF 6.6 K)
3M CI-T Series Connectors up to 35 kV - Product Selection Guide (PDF 7.0 K)
3M™ Lugs and Connectors, 2015 Electrical Products Catalog - Catalog (PDF 2.1 MB)
3M™ Splices, 2013 Electrical Products Catalog - Catalog (PDF 11.7 MB)