Pre-insulated aluminium compression sleeve. Dual-rated for aluminium to copper or aluminium to aluminium. Pre-insulated nylon jacket provides protection against moisture, extended shelf life and crimp ability at sub-zero temperatures. Colour coded end caps provides for ease of wire size identification (conforms to industry standards) and also prevents dirt and other contaminants from entering the connector prior to use. Anchoring rings inside jacket holds connector insert in place during installation. 3-4 to 5-6 stranded conductor range. Rated for 600 V ensures reliability.