180 Pieces Waterproof Black Heat Shrink Tubing Set – 3:1 Double Wall Heat Shrink Tubing – Adhesive Backed

3:1 Shrink Ratio – Shrinks to a third of its original diameter, ensuring an optimal seal. This solves the problem of insufficient shrinkage of 2:1 tubing. Internal Adhesive – When heated, the adhesive expands and seals the connection, creating a permanent airtight seal. Various Sizes – We offer the 7 most common diameters from 2.3 to 19.05 mm. The heat shrink tubing is pre-cut to 89 mm. Easy Application – Simply slide the heat shrink tubing over the connection point and heat. Professional connections in seconds. Double-Walled Tubing – The outer wall is abrasion-resistant. The inner wall provides a watertight seal and strain relief. Product Description HEAT ACTIVATED ADHESIVE Creates a watertight seal Higher tensile strength Resistant to stretching and vibration 3:1 shrink ratio Retains one-third of its original diameter More versatile than 2:1 tubing No air gaps between wire and tubing WATERPROOF The connection is watertight Protects against wire corrosion Can be immersed in water Super versatile heat shrink tubing. Want to repair a damaged wire, seal against moisture, or get better strain relief? Waterproof heat shrink tubing is an easy-to-use solution for electrical wiring projects in the automotive, marine, DIY, and home industries. It can be used in a variety of applications, such as: Electrical insulation (wire repair, insulation of electrical connector wires, protection of load cables, insulation of solder joints). Environmental sealing for protection from moisture, UV radiation, and fuels. Strain relief for electrical connectors. Wire and cable identification (color coding). Bundling of loose wires (usually in cable bundles). Thermal insulation for heat-sensitive components. Surface protection against abrasion, peeling, and dents. 3:1 heat shrink tubing. When heated, this heat shrink tubing shrinks to one-third of its original diameter. Due to its high recovery ratio, most damaged cable jackets can be repaired without removing the connectors. Therefore, 3:1 heat shrink tubing is more versatile than 2:1 heat shrink tubing. Additionally, 3:1 marine-grade heat shrink tubing shrinks more tightly around wires and connectors, preventing air from being trapped. Heat-activated adhesive layer. This is a waterproof heat shrink tubing with an internal adhesive layer. When heated, the heat-shrink tubing expands and the internal adhesive layer melts. A small bead of clear adhesive (about 1 mm wide) forms at the end of the heated tubing. After cooling, a hermetic seal is formed. The heat-activated adhesive adheres reliably to wires, connectors, and other surfaces. As it flows, the adhesive displaces air and fills the gaps between the bead and the tube, creating a watertight seal. For best results, we recommend using a heat gun. Double-Wall Heat Shrink Tubing: This marine-grade, double-walled heat shrink tubing offers excellent rigidity and abrasion resistance. The double-walled construction provides greater wear resistance. This metal heat shrink tubing is flame retardant.