The cold shrink insulation tubes 8420 and 8430 are EPDM tubes that feature a unique cold shrink connection system. The products are delivered pre-stretched on a removable support spiral, allowing for efficient and easy installation. When the support spiral is pulled out after positioning the tube, the tube shrinks and forms a waterproof seal. The active deformation of the specially formulated material ensures a permanent seal and insulation against the environment. Cold shrink insulation tubes from the 8420 and 8430 series are particularly useful for electrical insulation in all solid dielectric (rubber or plastic) insulated wires and cable splices up to 1,000 V. They are suitable for both indoor and outdoor use. They often provide good physical protection and shielding against environmental influences for communication lines and other non-electrical applications (including cable sheath repairs). The temperature range is from -40 °C to 90 °C. In applications where the product is continuously exposed to UV radiation, it should be wrapped with Super 33+ vinyl electrical tape or self-vulcanizing silicone rubber tape 70.