Dual-wall heat shrink tubing for building applications:Building sealing materials: Double-wall heat shrink tubing can be used as building sealing materials, such as socket structure sheaths, to provide sealing and waterproofing. Protective structures and equipment: In buildings, it can also be used to protect structures and equipment, such as bridges, elevators, exterior walls, etc., to provide additional protection and sealing effects.Co-extruded (double wall) heat shrinkable tubing,Heat-shrink tube,Heat shrinkable tubing,thermal contraction pipe,Shrink tube.