Blackburn PKL66-1 COMP PIN TERM 4/0 PIGTAIL .365X6

It's a compression reducer for wire or cable terminations. The aluminum sleeve crimps onto the conductor and a copper pigtail is pre-attached, giving you a smaller tinplated copper tail to land on equipment that won't accept the larger conductor directly. Blackburn calls it a pin terminal for 4/0 pigtail work, and the connection is made by compression, not a mechanical set screw.

Yes. The PKL66-1 carries a 35 kV voltage rating, so it's suitable for medium voltage cable terminations up through 35 kV class. That rating is the reason this part shows up in URD and padmount transformer work rather than ordinary building branch circuits.

That's exactly what it does. The barrel is aluminum and the pre-attached pigtail is copper with a tin plating, so it transitions an aluminum conductor over to a copper tail without you making a dissimilar metal connection in the field. The tin plating on the pigtail is what protects the copper at the landing point.

It ships bare. No insulation is supplied on the sleeve or the pigtail, so the installer is responsible for the insulating and sealing system over the finished crimp, whether that's tape, heat shrink, or a cold shrink kit appropriate to the cable class.

The PKL66-1 is rated for 2 conductors and is sold individually, one piece per unit. If you're terminating a three phase run you're buying one per phase, so count your terminations before you order rather than assuming a kit quantity.

You need compression tooling. This is a compression connector, not a set screw or mechanical lug, so it has to be crimped with the proper die set for the barrel. There's no torque spec to chase because nothing threads down.

Blackburn PKL66-1 is the manufacturer part number, and the country of origin is Mexico. Specify that number directly when matching an existing installation, since pigtail diameter and sleeve length vary across the PKL family and a near number will land you a different tail size.