Skip to Content

Free Shipping on all orders over $50.00

0

Search
You have 0 items in your cart

You have 0 items in your cart

Home
Products
- On Sale
  
  What's New
  Hose & Fittings
  Hardline & Hardline Fittings
  - Clamps
  Workshop
  Fuel Systems
  Turbo, Superchargers & Nitrous
  Engine Components & Accessories
  Electrical Accessories & Gauges
  Racing & Safety Accessories
  - Race Car Accessories
  Wheels & Tyres
  - Wheel Studs, Nuts & Washes
  - Racing Wheels
  Transmission & Driveline
  Fittings & Adapters
  - Hose Ends
  - Cooling
  Silicone Hose
  - Hoses
  - Clamps
  Air Cleaners & Filters
  Cooling, Insulation & Air Conditioning
  Exhaust Accessories
  Brake Hose & Fittings
  - Hose Fittings
  - Valves
  Fabrication & Fasteners
  Oil Systems & Accessories
  Tanks
  Chassis, Suspension & Steering
  - Chassis
  Electrical
  Safety Equipment
Brands
- Aeroflow Performance
  
  AutoPlumb
  
  BrakeQuip
  
  Rocket Industries
  
  Phenix
  
  GIBBS Lubricant
  
  Mityvac
  
  Speedflow
  
  Fast Fill Systems
  
  XRP
Services
- Our Services
  
  Mobile Services
Build of the Month
Rapid Hydraulics
Contact Us

You have 0 items in your cart

My shopping cart

Your cart is currently empty.

Continue Shopping

Hit space bar to expand submenuProducts

On Sale
What's New
Hit space bar to expand submenuHose & Fittings

Hoses
Hose Clamps
Fittings

Hit space bar to expand submenuHardline & Hardline Fittings

Clamps

Hit space bar to expand submenuWorkshop

Air Tools
Blasting Equipment
Cooling & Ventilation
Garage Jacks
Parts Washers
Tools
Engine Tools
Valve Train Tools

Hit space bar to expand submenuFuel Systems

Fuel Rails & Adapters
Fuel Pumps & Accessories
Fuel Surge Tanks
Fuel Filters & Accessories
Electronic Injection
Fuel Blocks, Logs & Y-Blocks
Carburettors

Hit space bar to expand submenuTurbo, Superchargers & Nitrous

Turbochargers & Components
Turbo Accessories
Nitrous Accessories

Hit space bar to expand submenuEngine Components & Accessories

Engine Bay Accessories
Cylinder Heads
Intake Manifolds
Engine Components
Engine Dress-Up
Engine Tools

Hit space bar to expand submenuElectrical Accessories & Gauges

Gauges & Accessories
Electrical Accessories
Fuses, Switches & Relays
Wiring Looms, Harnesses, Plugs & Pins

Hit space bar to expand submenuRacing & Safety Accessories

Race Car Accessories

Hit space bar to expand submenuWheels & Tyres

Wheel Studs, Nuts & Washes
Racing Wheels

Hit space bar to expand submenuTransmission & Driveline

Shifters
Differential
Automatic Transmission

Hit space bar to expand submenuFittings & Adapters

Hose Ends
Cooling

Hit space bar to expand submenuSilicone Hose

Hoses
Clamps

Hit space bar to expand submenuAir Cleaners & Filters

Breathers
Pod Filters
Round Elements
Filter Accessories
Filter Assemblies

Hit space bar to expand submenuCooling, Insulation & Air Conditioning

Cooling
Thermostats
Insulation

Hit space bar to expand submenuExhaust Accessories

Exhaust Hangers
Headers & Manifolds
Exhaust Fabrication
Cut-Outs & Control Valves

Hit space bar to expand submenuBrake Hose & Fittings

Hose Fittings
Valves

Hit space bar to expand submenuFabrication & Fasteners

Assorted Fasteners
Engine Fasteners
Fabrication
Flexible Joints
Half & Full Donuts
Weld-On's
Wheel Nuts

Hit space bar to expand submenuOil Systems & Accessories

Oil Coolers & Accessories
Oil Filters
Oil Pans / Sumps
Oil Pumps
Breather Tanks

Hit space bar to expand submenuTanks

Fuel Surge Tanks
Fuel Cells
Power Steering Tanks

Hit space bar to expand submenuChassis, Suspension & Steering

Chassis

Hit space bar to expand submenuElectrical

Electronic Throttle Control
Sensors
Wiring Looms, Harnesses, Plugs & Pins

Safety Equipment

Hit space bar to expand submenuBrands

Aeroflow Performance
AutoPlumb
BrakeQuip
Rocket Industries
Phenix
GIBBS Lubricant
Mityvac
Speedflow
Fast Fill Systems
XRP

Hit space bar to expand submenuServices

Our Services
Mobile Services

Build of the Month

Rapid Hydraulics

© 2025 Rapid Performance Parts

Sign up for our newsletter

Sign up for our mailing list to receive new product alerts, special offers, and coupon codes.

Enter email address

Product Filter

Weld-On's

Home
Weld-On's
Radiator Necks

Manufacturer

Aeroflow

Product

Billet Alloy Caps
Billet Alloy Filler & Cap
Billet Filler Cap & Bung
EGT Bung & Cap
Radiator Necks

Construction

Aluminium
Stainless Steel
Steel

Type

Female
Male

Manufacturer

Aeroflow

Product

Billet Alloy Caps
Billet Alloy Filler & Cap
Billet Filler Cap & Bung
EGT Bung & Cap
Radiator Necks

Construction

Aluminium
Stainless Steel
Steel

Type

Female
Male

1 product found in Weld-On's

Sort by

Quick View

BILLET RADIATOR NECK WELD ON RAW FINISH LARGE CAP 42MM ID

BILLET RADIATOR NECK WELD ON RAW FINISH LARGE CAP 42MM ID

From $39.20

Sign up for our newsletter

Sign up for our mailing list to receive new product alerts, special offers, and coupon codes.

Enter email address

Rapid Performace

We pride ourselves on being a “One Stop shop”, If you think we have it, we probably do. So call us or drop in today, you’ll be pleasantly surprised & leave knowing you’ve received some of the highest quality customer service around.

Get Social

© 2025 Rapid Performance Parts | Designed by Ashbury Studios