Adopting the overall pre-fabricated design of liquid silicon rubber materials, 3 M product has good insulation performance, anti tracking, fire resistance and acid base, constant shrinkage strength. The twist of cable could not cause the insulation dead corner. One specific type is available for several kinds of cables with different diameters and the low temperature condition shall not influence the construction and operation quality. This product is available in transitional connector and adapter and would be suitable for kinds of connective tubing.