1/8" DUAL WALL

At these smaller gauges — 20 AWG down to thermocouple wire — moisture wicking along the conductor is the primary failure mode. A standard single-wall tube leaves the splice electrically insulated but still open to capillary ingress. The adhesive liner in Helixal dual wall tubing flows under heat and bonds directly to the wire jacket, blocking any liquid path. For LED harnesses and sensor leads that run outdoors or under dash where condensation accumulates, this single step eliminates the most common source of intermittent faults.