Radiator Filler Neck – Weld‑On, Billet Aluminium

Upgrade your cooling system with our premium weld-on radiator filler neck—built for durability, ease of installation, and flawless performance.

🔧 Key Features

• CNC-machined 6061-T6 aluminium for ultra-strong, corrosion-resistant construction,

• Large base flange design prevents distortion during welding and ensures a secure, par-weld fit.

• Built-in 1/16″ NPT x 1/4″ barb for seamless connection to expansion tanks or overflow systems .

✅ Benefits You’ll Appreciate

• Easy coolant top-ups with your choice of standard radiator cap, ideal for custom radiators or high-performance applications 

• Prevent leaks & pressure loss: securely weld to your alloy radiator, ensuring a sealed system under max thermal stress

• Universal compatibility: fits OEM caps and works with popular vehicles (Toyota, Honda, Nissan, Mitsubishi, Holden, Mazda ect)

⚙️ Who It’s For

• Fabrication Shops & Motorsport builders crafting custom radiators or swell tanks

• DIY enthusiasts upgrading cooling systems for boosted, turbo, or classic rides

• Professional garages seeking a reliable filler neck for bespoke alloy radiator fabrication

📦 Package Contents

1× weld-on billet radiator neck
1× 1/16″ NPT to 1/4″ barb overflow spout
(Optionally bundled with a high-pressure radiator cap sold separately)

🚨 Don’t Settle for Less

These weld up really well, they preform to the top level and are made from quality materials!

Ready to Perform?

🎯 Add the weld-on filler neck to your build today. Whether restoring, upgrading, or going full custom, this small part offers maximum performance and reliability.

What are you waiting for grab one now!

We ship world wide, if you cannot proceed through checkout contact us for a custom shipping quote.