3:1 SHRINK RATIO: 2:1 heat shrink tubing leaves gaps — our wire shrink wrap tubing contracts to exactly 1/3 of its expanded diameter for a zero-gap grip. Activates at 80-125°C; use a heat gun or lighter for a tight, professional-grade seal on any wire connection in seconds.
DURABLE DUAL WALL: Dual wall heat shrink tubing that doubles as heavy duty heat shrink tubing — rigid outer wall resists abrasion, UV, and impact, while the adhesive inner layer provides firm strain relief to keep wire connections permanently seated under tension and vibration.
WATERPROOF SEALED: Our marine grade waterproof heat shrink tubing forms a permanent bond — adhesive lined inner wall melts on heating to seal out moisture, oil, fuel, chemicals, and salt water. Built for marine, automotive, and industrial connections that demand lifetime watertight protection.
GRADE A CERTIFIED: Grade A Polyolefin industrial heat-shrink tubing — SGS, RoHS, and ISO certified electrical heat shrink tubing that is non-flammable, flame-retardant, and chemical-resistant. Engineered to meet the world's most demanding global safety and compliance standards.
VERSATILE 55FT ROLL: One roll of black heat shrink tubing covers marine, automotive, industrial, and DIY projects — 55 feet of shrink tubing for wires in a single cut-to-fit roll. No waste, no extra orders; one complete, cost-effective package for beginners and professionals alike.
Protect your electrical connections with Ni-SO’s heavy-duty heat shrink tubing. Designed for demanding environments, this roll provides a reliable, waterproof seal that will keep your wires secure and shielded.
Key Highlights
Secure Connections: The 3:1 shrink ratio ensures a tight, gap-free seal for superior wire protection.
Durable Construction: Dual-wall design offers exceptional resistance to abrasion, UV, and impact.
Waterproof Protection: Adhesive-lined inner wall creates a permanent waterproof seal against moisture, chemicals, and salt water.
Easy Application: Shrinks quickly and easily with a heat gun or lighter for a professional finish.
Useful Facts
Dimensions: 4.8 x 4.72 x 2.32 inches
Weight: 0.634 ounces
Manufacturer: Ni-SO
Material: Grade A Polyolefin
Good Fit For
Marine applications
Automotive wiring
Industrial electrical projects
Any application requiring a durable, waterproof wire seal
