3 PK ILSCO ASN-350 Aluminum Compression Sleeve for 3/0–350 kcmil Conductors 3 PK ILSCO ASN-350 Aluminum Compression Sleeve for 3/0–350 kcmil Conductors NEW NO BOX The ILSCO ASN-350 is an aluminum compression sleeve designed for 3/0 AWG to 350 kcmil conductors.