3M CIR-22 Connector , 4 AWG (220 mil only) stranded, 2 AWG solid, O.D. 0.64 in (16,2 mm), 10 per case
This connector has 5411R splice body and a 0.63 in (16 mm) O.D. This connector is to be used with molded rubber splice kits.
The 3M™ Connector CIR-22 is an extra long connector that is used to bridge gaps up to six inches when a piece of damaged cable is removed. They can be used with copper or aluminum conductors.