This connector is a pink, 500 kcmil with a length of 3.880 in (98,6 mm), a 0.843 in (21,4 mm) I.D. and a 1.320 in (33,5 mm) O.D.
The 3M™ Scotchlok™ Aluminum Connector 20014 is for use with copper or aluminum conductors. These aluminum connectors feature color coded end caps for identification. Contact aid provided in connector barrel is compatible with poly/EPR insulations.
Scotchlok Aluminum Compression Connectors - Data Sheet (PDF 37.2 K)