8420 Series insulators are open ended tubular rubber sleeves. Factory expanded and assembled on a removable core they are supplied for field installation. Once positioned for installation the core is removed allowing the tube to shrink and create a waterproof seal.

• Easily installed
• Suitable for various cable sizes
• Torches or heat not required
• Good thermal stability
• Tight seal
• Resilience and pressure remain consistent after years of ageing and exposure
• Excellent wet electrical properties
• Tough rubber formulation
• Waterproof
• Fungus resistant
• Acid and alkalis resistance
• Ozone and ultra violet light resistance

• Primary electrical insulation for all solid dielectric insulated wire (rubber and plastic) and cable splices with 1000 V rating
• Direct burial or submersed
• Indoor, outdoor or overhead use
• Provides physical and moisture sealing protection for high-voltage air insulated connectors and lugs. Examples - Spacer cable and lug connections to busbar
• Secondary splice copper or aluminium conductor insulation
• Service relocation
• Inline conductor transition connector insulation

• 307-774 is a 457 mm long cold shrink sleeve with a 67.8 mm sleeve diameter
• 307-825 is a 203.2 mm long cold shrink sleev ewith a 20.9 mm sleeve diameter
• 307-831 is a 279 mm long cold shrink sleeve with a 30.1 mm sleeve diameter
• 307-847 is a 203.2 mm long cold shrink sleeve with a 20.9 mm sleeve diameter
• 308-014 is a 303.5 mm long cold shrink sleeve with a 35.1 mm sleeve diameter
• 308-042 is a 152 mm long cold shrink sleeve with a 67.8 mm sleeve diameter
• 308-109 is a 228.6 mm long cold shrink sleeve with a 30.1 mm sleeve diameter

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.

Don't leave your connections exposed to the elements – with this 3M cold shrink tubing, you can create a secure seal. Its open-ended, tubular construction comes pre-stretched on a temporary core. When the core's removed, the tubing shrinks from an inner diameter of 23.9mm to a shrunk inner diameter of 6.1mm. This creates a strong covering that's resistant to water, chemicals and UV rays, keeping your conduit couplings safe. The tubing insulates cable splices and wires rated to 1000V, making it a reliable choice for high-powered installations.

• Robust EPDM rubber material stands up to wear, so you get long service
• Performs without a hiccup in a temperature range between -40°C and +90°C
• No torches, heat or special tools are needed for installation

• Wind power installations
• Mechanical engineering
• Telecommunication systems

It's 203.2mm long, making it handy for covering joins, with no need for trimming.