The 3M 8420 series black 229mm cold shrink connector insulator is an open-ended, tubular, rubber sleeve. It is factory expanded and assembled onto a removable core. The core is removed after the tube is positioned for installation over an inline connection and terminal lug. This allows the tube to shrink and form a water-resistant seal. The insulating tube is made of EPDM rubber, which contains no chlorides or sulphurs. It is available in diameter sizes that cover a range of cable up to 1000V for copper and aluminium conductors.

• Sleeve diameter is 67.8mm
• Shrunk diameter is 32.2mm
• Excellent wet electrical properties
• Good thermal stability
• Improved, tougher rubber formulation to withstand backfilling
• No mastic or tape required to seal
• No torches or heat required
• Resists acids and alkalis, resists ozone
• Seals tight, retains its resiliency and pressure even after prolonged years of aging and exposure
• Simple installation, requires no tools
• Water-resistant
• Tough rubber formulation withstanding rough backfilling

• Dig-in repairs
• Direct burial or submersible. For indoor and outdoor
• Environmental sealing for communication and other non-electrical applications
• Insulation of secondary splices, copper, or aluminium conductors
• Physical protection and moisture sealing for air-insulated connectors and lugs such as spacer cable and lug connections to bus bar
• Primary electrical insulation for all solid dielectric (rubber and plastic) insulated wire and cable splicing rated to 1000V
• Relocation of service
• Sheath repairs

NEMA Pub. No. PP-C1
Meets the water seal requirements of ANSI C119.1

3M is a trusted name in connector and wiring solutions, providing high quality cables, connectors and accessories. From industrial computing to domestic applications, 3M provides the reliable and versatile product range you need.