Cool Tube Extreme 1.25in x 36in

The Cool Tube Extreme 1.25in x 36in from Design Engineering is a professional-grade thermal management solution engineered for engine bays, exhaust systems, and high-temperature plumbing in performance vehicles. Built by technicians who understand that underhood heat directly impacts fuel quality, component longevity, and engine efficiency, this split-design sleeve protects hoses, fuel lines, and wiring harnesses from radiant and conducted heat. Whether you're running a naturally aspirated build or a forced-induction platform, controlling heat migration in your engine compartment is non-negotiable for reliability and repeatability.

This tube features an aluminized fiberglass construction that reflects radiant heat while maintaining flexibility for routing around tight engine bay geometry. The 1.25-inch inner diameter accommodates standard hose sizes common in fuel systems, coolant lines, and wire bundles, while the 36-inch length provides ample coverage for most stock and modified applications. The split design allows installation without complete system disassembly—simply wrap and secure with appropriate clamps or fasteners. Aluminized fiberglass offers superior durability compared to foam sleeves, resisting abrasion, fuel contact, and thermal cycling that would degrade lesser materials over thousands of miles.

Enthusiasts upgrading fuel systems, installing aftermarket headers, or relocating components benefit most from this sleeve's ability to maintain stable fluid temperatures and protect wiring insulation from degradation. Installation is straightforward: measure your run length, position the split tube around the target line or bundle, and secure with stainless steel clamps or aluminum fasteners to prevent unwanted movement. The compact packaging (11.95 x 2.15 x 12.05 inches) makes storage convenient, and the silver aluminized finish provides both function and a finished appearance in visible engine bay locations.