3/8in OD (9.5mm) Hard Li ne - 25 Foot Spool

The 3/8in OD (9.5mm) Hard Line - 25 Foot Spool from Vibrant Performance is a precision engineered fluid line designed for serious automotive builders and mechanics tackling fuel, oil, and coolant system upgrades. Hard lines eliminate the failure points common to rubber hose—degradation, permeation, and pressure loss—making them essential for high-performance engines, fuel injection conversions, and custom plumbing where reliability under load is non-negotiable. This 25-foot spool provides ample material for complete system fabrication or multiple vehicle projects without waste.

Constructed from seamless aluminum tubing with a 3/8-inch outer diameter (9.5mm), this hard line delivers superior pressure retention and thermal stability compared to braided rubber alternatives. The hard-anodized finish resists corrosion and heat damage in engine bays and fuel cell compartments, while the rigid construction allows precise routing without kinking or collapse under boost or fuel pressure spikes. Vibrant Performance's manufacturing standards ensure consistent wall thickness and bore tolerances, critical for accurate fuel flow rates and system response in carbureted, EFI, and forced-induction applications.

Fabricators, restoration shops, and engine builders favor this spool for custom fuel systems, oil cooling circuits, and radiator bypass lines where durability and professional appearance matter equally. The 25-foot length accommodates full-frame or mid-engine conversions, and the tubing accepts standard -6 AN fittings and compression couplers for seamless integration with existing fuel rails, filter housings, and cooler mounts. Proper bending requires a quality tube bender to maintain wall integrity and flow characteristics—cutting and flaring should follow OEM specifications for your application's pressure rating.