2. Polyurethane insulation material (or use rock wool tube, glass wool tube, rubber and plastic sponge, etc.)
3. Hole in the middle of the heat shrinkable sleeve
4. Put the heat shrink sleeve on one end of the pipeline
5. Pipeline connection
6. Wear the heat-shrinkable sleeves on both ends of the two pipelines
7. Heat and paste both ends of the heat-shrinkable sleeve
8. Mix and stir the ingredients according to the proportion and pour them into the heat-shrinkable sleeve, and the materials are chemically reacted to form a rigid polyurethane foam.
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