Fire Sleeve 4AN 12mm ID 6ft Black

The Fire Sleeve 4AN 12mm ID 6ft Black from REDHORSE PERFORMANCE is a heat-resistant sleeve designed to protect braided fuel lines, brake lines, and transmission cooler lines in high-temperature engine bays. Built for mechanics and automotive enthusiasts who demand durability in demanding applications—whether you're running a turbocharged setup, modified fuel system, or vintage restoration—this sleeve shields vulnerable hose runs from radiant engine heat, road debris, and abrasion. Its compact 6-foot length makes it ideal for point-to-point protection on mid-size engine compartments or multiple shorter runs across manifolds and headers.

Constructed with a woven fiberglass exterior rated for continuous exposure to extreme temperatures, this fire sleeve features a 12mm inner diameter that accommodates 4AN hose without restricting flow or creating pressure points. The black synthetic material resists UV degradation and maintains its integrity even under sustained thermal cycling—a critical factor when protecting fuel systems near turbos or superchargers where underhood temps regularly exceed 200°F. The braided construction allows controlled bundle management while the flexible core permits routing around tight corners and engine bay obstacles, eliminating the need for rigid conduit that complicates installation and maintenance.

This sleeve is essential for any fuel system upgrade, forced-induction build, or performance cooling modification where OEM routing passes near hot surfaces. Professional builders use fire sleeves as insurance against pinhole leaks caused by heat damage—a preventive measure that pays for itself in avoided downtime and safety liability. Installation requires only cutting to length and sliding over existing hose before routing through the engine bay; no special tools or permanent modifications needed. Compatible with any 4AN braided hose system, it pairs seamlessly with aftermarket fuel rails, braided brake line kits, and transmission cooler setups on import and domestic platforms.