This AN bulkhead fitting adapter is engineered to deliver secure, high-performance fuel line connections across a wide range of automotive and motorsport applications. Crafted from lightweight yet durable 6061-T6 aluminum, this fitting features a precision-machined radiused entry that allows for unrestricted fuel flow while minimizing turbulence. Its anodized black surface finish offers long-lasting corrosion resistance, making it ideal for harsh environments including underhood conditions and exposed chassis areas. The included locking nut and dual oil-resistant washers ensure a reliable, vibration-resistant seal on fuel cell walls, firewalls, or oil cooler panels. With a temperature rating from -65℉ to 252℉ and a maximum pressure tolerance of up to 4000 psi, this adapter is designed to meet the demands of high-pressure fuel delivery systems. Whether you're upgrading an EFI setup, rerouting fuel lines, or installing a return system, this universal an bulkhead fitting provides the strength, compatibility, and performance trusted by automotive enthusiasts and professional fabricators alike. Upgrade your build today with hardware you can count on.