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Hard line tube fittings to AN Male fittings
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  • Hard line tube fittings to AN Male fittings
  • Hard line tube fittings to AN Male fittings
  • Hard line tube fittings to AN Male fittings
  • Hard line tube fittings to AN Male fittings
  • Hardline to AN Adapter Size Guide with measurement chart and illustrations for Hot Rod AN LLC
Hard line tube fittings to AN Male fittings

Hard line tube fittings to AN Male fittings

$13.99 USD
Free Shipping $99+Free Shipping $99+ Lifetime WarrantyLifetime Warranty Expert SupportExpert Support

Hardline Tube to AN Male Adapters

Adapt factory hardlines to AN fittings for clean, leak-free fuel systems. Works with 1/4", 5/16", 3/8", and 1/2" hardline. Rated to 250 PSI when properly installed.

  • Convert OEM hardlines to AN in minutes—no guesswork, no cobbled adapters.
  • Perfect for EFI conversions, LS/LT swaps, and fresh fuel plumbing.
  • Clean, serviceable connections that pair with Hot Rod AN PTFE hose and fittings.
  • Common hardline sizes supported: 1/4", 5/16", 3/8", 1/2".
  • Pressure rating: up to 250 PSI when properly installed.

Where these adapters shine

  • Fuel sending unit outlets to AN for modern hose routing.
  • Factory feed/return lines to AN when upgrading to PTFE hose.
  • Carb-to-EFI conversions (regulator, filter, return line updates).
  • LS/LT swaps: integrate OEM truck/car hardlines with AN systems.
  • External fuel filter/regulator installs with Hardline smooth tube for rubber hose

Specs

Hardline sizes 1/4", 5/16", 3/8", 1/2"
Outlet AN male (select size in options)
Pressure Up to 250 PSI (proper install required)
Primary use Fuel system plumbing
Install tips:
  1. Measure hardline OD (outside diameter) and select the matching adapter.
  2. Cut the tube square and de-burr inside and outside (critical for sealing).
  3. Follow the adapter’s assembly order (nut/sleeve/compression as applicable) and tighten per spec.
  4. After assembly, pressure-test the system before driving.

Important: For fuel system use only. Not for brake lines or power steering.

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Free Shipping Free Shipping $99+ (USA)
Expert Support Real Expert Support

FAQs

How do I pick the right size?
Match the adapter to your hardline’s measured OD (1/4", 5/16", 3/8", or 1/2"). Then select the AN outlet size to fit your hose/fitting system.
Will this work for an LS swap?
Yes—these are ideal for connecting OEM hardlines to AN for modern fuel systems. For a complete plumbing solution, see our LS swap fuel line kits.
What pressure can it handle?
Up to 250 PSI when properly installed and verified by a pressure test.
What hose should I pair with this?
Use Hot Rod AN PTFE hose bundles and AN hose ends for a complete, ethanol-compatible EFI setup.
Any installation cautions?
Always cut/deburr properly, assemble in the correct order, tighten to spec, and pressure-test. Do not use for brake or power steering circuits.
Warranty
Backed by our lifetime warranty against manufacturing defects. Contact support with your order number and photos for a quick resolution.
Shipping
Fast shipping from the USA. Free shipping on orders $99+ (USA). Rates and options shown at checkout.
Returns
Hassle-free returns on new, unused items in original packaging per our Returns Policy.
Quality
Purpose-built for fuel system use and designed to pair with Hot Rod AN PTFE hose and AN fittings for leak-free performance.

 

Customer Reviews

Based on 36 reviews
92%
(33)
3%
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C
Christopher King

Very good product

Good morning, thank you for your feedback. We appreciate the support!

R
Richard Charlton
Fuel line fittings

All fitting’s ordered worked perfectly

M
Matthew L
Amazing customer service

Justin and his guys are amazing, I was having a issue with my sending unit leaking and my AN fitting install did not go so well, I needed to get a new unit and Justin offered to install the fittings for me and send it on its way. best place to go for Fuel hose and fuel system parts.

M
Marvin Bustos
Hard line adapter

Adapter worked perfectly. Good quality item and delivered in a timely manner. Awesome company, even returned some items I ordered wrong with no hassle. This is definitely one of the best parts companies as far as customer service and timeliness is concerned.

J
Jason Kerwin
PTFE Hose and Fittings

I ordered the 6AN PTFE stainless braided hose and a bunch of assorted fittings. Everything looks top notch!! Haven't put it to use yet but I'm sure I'll more than happy with it!

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