1/2" 3:1 Marine Heat Shrink Tubing 2 Pack Red Black Waterproof Dual Wal

1/2" 3:1 Marine Heat Shrink Tubing 2 Pack Red Black Waterproof Dual Wal

• 【BLACK + RED COMBO — COMPLETE POLARITY WIRE IDENTIFICATION KIT】This convenient 2-pack includes 1 roll of black (negative/ground) and 1 roll of red (positive/power) 1/2" (12.7mm) heat shrink tubing, 4.92 feet each. Everything you need to color-code and waterproof-seal battery cables, marine wiring, and power circuits in one package — no need to buy separate rolls.
• 【3:1 DUAL WALL ADHESIVE LINED — PERMANENT WATERPROOF SEAL】Both black and red tubes feature industrial-grade 3:1 shrink ratio, recovering from 1/2" (12.7mm) to 3/16" (4.2mm). Built-in hot-melt adhesive creates a complete 360° waterproof, vibration-proof insulation barrier. Fits wires from 4 AWG to 1 AWG.
• 【MARINE GRADE WATERPROOF — UL LISTED FLAME RETARDANT】Cross-linked polyolefin outer wall with UL224 VW-1 flame retardant certification. Resists saltwater, fuel, oil, UV, and temperatures from -55°C to 125°C. Trusted for marine battery bank wiring, RV power systems, and automotive battery terminal insulation.
• 【PERFECTLY SIZED FOR BATTERY CABLE PROJECTS】The 1/2" diameter and 4.92-foot length per color is ideal for single-vehicle or single-boat battery cable insulation projects. Color-code positive and negative terminals on marine trolling motor batteries, car audio amplifier power cables, and RV house battery connections.
• 【EASY APPLICATION — WISUWORE QUALITY GUARANTEE】Apply heat evenly with a heat gun at 250°F-300°F. Adhesive bonds permanently during shrinking. Package: 1 × 4.92 FT black + 1 × 4.92 FT red wisuwore 1/2" dual wall heat shrink tubing (9.84 FT total).