OEM-Equivalent Quality certified

OEM-Equivalent Quality

ICEBOX Replacement Parts certified

ICEBOX Replacement Parts

Brass Radiator Filler Neck Replacements

Brass Radiator Filler Neck Replacements are precision-engineered components designed to restore the integrity of heavy-duty truck cooling systems. Compatible with a wide range of Peterbilt models, these durable brass filler necks ensure a reliable, leak-free seal, making them essential for fleet maintenance and commercial trucking repair applications.

Peterbilt Cooling & Radiator Parts Collection

Our Range of Products
Peterbilt Cooling & Radiator Parts Collection

Peterbilt Cooling & Radiator Parts Collection

  • 285 SKUs across 23 Peterbilt part types
  • Fits 14+ Peterbilt models, cab & conventional
  • Full cooling kits plus individual components

Frequently Asked Questions

What is a brass radiator filler neck and what does it do?

A brass radiator filler neck is the threaded opening on the radiator through which coolant is added to the system. It connects the radiator to the radiator cap, maintaining pressure and preventing leaks. Brass is the preferred material due to its corrosion resistance, durability, and ability to withstand high-temperature and high-pressure cooling system environments in heavy-duty trucks.

Which Peterbilt models are these brass filler neck replacements compatible with?

Why should I choose a brass filler neck over plastic or aluminum alternatives?

How do I know if my radiator filler neck needs to be replaced?

Are these replacement filler necks OEM quality?

Can I order a brass filler neck for a fleet of Peterbilt trucks?

How do I place an order or check pricing for a brass filler neck?

Didn't find what you're looking for?

Talk to our experts for custom solutions and tailored guidance.

Industries We Serve

Commercial Trucking & Freight

Commercial Trucking & Freight

Brass filler neck replacements keep Peterbilt long-haul and freight trucks running with leak-free cooling system performance.

Fleet Maintenance & Repair

Fleet Maintenance & Repair

Fleet maintenance shops rely on compatible brass filler necks to efficiently service and repair multiple Peterbilt truck models.

Vocational & Specialty Trucking

Vocational & Specialty Trucking

Vocational Peterbilt trucks in construction, municipal, and utility sectors depend on durable brass filler necks for reliable uptime.

Equipment Repair Shops

Equipment Repair Shops

Independent and dealer repair shops use OEM-equivalent brass filler necks to restore Peterbilt cooling systems to factory performance.

Didn't find what you're looking for?

Talk to our experts for custom solutions and tailored guidance.

You might also like

Radiator Caps, Drain Plugs & Cooling Components for Caterpillar Equipment | Radiator Caps & Coolant Reservoir Caps

Radiator Caps & Coolant Reservoir Caps

Radiator caps and coolant reservoir caps are critical pressure-regulating components in heavy equipment and commercial vehicle cooling systems. Radiator Supply House stocks caps compatible with major brands including Caterpillar, Komatsu, John Deere, Freightliner, and Peterbilt, ensuring proper system pressure and preventing coolant loss across construction, trucking, and industrial applications.
RV & Bus Cooling Components Collection | Radiator Support Replacement Parts

Radiator Support Replacement Parts

Radiator Support Replacement Parts from Radiator Supply House cover structural and cooling system components including side rails, mounting brackets, tanks, shrouds, crossmembers, and gaskets for heavy-duty trucks, RVs, buses, and emergency vehicles. Compatible with Peterbilt, Kenworth, Freightliner, International, and more.
Radiator Caps, Drain Plugs & Cooling Components for Caterpillar Equipment | Radiator Drain Plugs — Find the Right Part

Radiator Drain Plugs — Find the Right Part

Radiator drain plugs and petcocks are essential cooling system components used to safely drain coolant from heavy equipment, commercial trucks, and industrial machinery. Radiator Supply House stocks drain plugs compatible with major brands including Caterpillar, Komatsu, John Deere, Freightliner, and Peterbilt, ensuring reliable maintenance solutions.

Why Fleet Operators & Truck Repair Shops Choose Radiator Supply House

Specialized Cooling System Expertise

Radiator Supply House focuses exclusively on cooling system components, ensuring deep product knowledge and access to the right brass filler necks for your Peterbilt trucks.

Extensive Peterbilt Model Coverage

Our catalog covers 285+ SKUs compatible with Peterbilt 281, 351, 352, 359, 377, 378, 379, 387, 388, 389, T270, and more — one source for your entire fleet.

OEM-Equivalent Quality You Can Trust

All replacement filler necks meet OEM-equivalent standards under the ICEBOX brand, delivering reliable, leak-free performance that stands up to demanding heavy-duty applications.

Need a Brass Filler Neck for Your Peterbilt? Let's Help.

Submit your request and our cooling system specialists will confirm compatibility, pricing, and availability — fast.

Contact Us Today

For immediate assistance, feel free to give us a direct call at +1 877-615-3002.