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SKU: MMFN-L | UPC: 748354803853
Mishimoto 42mm Aluminum CNC Fill Neck MMFN-L
CNC machined from solid aluminum, the Mishimoto 42mm Aluminum CNC Fill Neck delivers precise coolant filling for custom radiator builds. Designed for welding onto fabricated aluminum radiators, it ensures reliable sealing and overflow management in performance applications. Pair it with Mishimoto radiator caps for consistent pressure handling in racing or street projects.
Key Features
- CNC Machined Aluminum: High-strength construction resists corrosion and withstands high-pressure cooling systems in demanding environments.
- 42mm Neck Diameter: Large opening allows fast coolant fills and easy viewing of fluid levels during maintenance.
- Screw-in Overflow Nipple: Integrated 1/4-inch NPT fitting connects directly to overflow tanks for clean hose routing.
- Weld-Ready Design: Flat mounting flange measures 60mm wide by 40mm high for secure TIG welding to custom radiator tanks.
- Cap Compatibility: Matches Mishimoto radiator caps for OEM-level sealing and pressure retention up to 30 PSI.
Product Notes
- Intended for welding to 0.08-inch thick aluminum radiator tanks using TIG method.
- Clean surfaces thoroughly before welding to prevent contamination.
- Compact packaging fits easily in tight shipping spaces.
Installation Notes
- Professional installation recommended.
- TIG weld to radiator tank. use argon shielding gas for clean joints.
- Hardware not included. torque cap to 4-5 Nm after install.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | All | Custom Radiator Builds | Fabrication Projects |
Why Choose Mishimoto?
- Trusted by racers worldwide for cooling components in motorsports.
- Direct-fit engineering from dyno-tested designs.
- Precision manufacturing with rigorous quality checks.
Frequently Asked Questions
-
Q: Does this fit specific vehicles?
A: Universal design fits any custom aluminum radiator fabrication project across all makes, models, and years. -
Q: What material and finish does it have?
A: Solid billet aluminum with raw machined finish ready for welding. bare aluminum requires no additional plating. -
Q: What is the warranty and install support?
A: Backed by Mishimoto lifetime technical support. stainless steel lifetime warranty, aluminum parts covered for durability.
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: 3.5 x 3.5 x 3.1 inches box
- Weight: 0.44 lbs gross shipping weight
Filler Necks
Filler necks are the structural tubes that connect a vehicle's fuel cap opening in the body to the fuel tank below, serving as the primary refueling pathway while incorporating anti-rollover valves, vent hoses, and vapor recovery system connections required by modern emissions standards. A damaged or corroded filler neck causes fuel odor inside and outside the vehicle, difficulty seating the fuel cap, fuel cap warning lights on OBD-equipped cars, and potential fuel leak hazards that demand prompt attention. Steel and stainless steel replacement filler necks are available for most domestic and import vehicles, with exact-fit options that replicate the OEM routing and attachment bracket positions for straightforward bolt-on installation. This collection covers replacement filler neck assemblies for passenger cars, trucks, and SUVs across major makes and model years.Popular UpgradesDirect-fit replacement filler neck assemblies for popular rust-prone applications including Ford F-150, C...
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Mishimoto
Shop premium Mishimoto performance parts at Black Ops Auto Works, including Mishimoto radiators, intercoolers, oil coolers, baffled catch cans, silicone radiator hoses, thermostats, intake systems, charge pipes, transmission coolers, exhaust tips, wheel accessories, and universal cooling components. Mishimoto is a leading aftermarket brand for performance cooling, airflow, oil control, and engine bay upgrades. Whether you are building a street car, track car, tow rig, diesel truck, Jeep, off-road SUV, or daily driver, this collection helps you find Mishimoto parts by brand, vehicle application, and product category. Shop Mishimoto Cooling, Intake & Performance Parts Black Ops Auto Works carries a wide selection of Mishimoto aftermarket parts for cars, trucks, SUVs, Jeeps, diesel applications, and universal performance builds. Mishimoto Radiators & Cooling Components - performance aluminum radiators, coolant hoses, thermostats, expansion tanks, and thermal bypass solutions ...
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