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Product Details
| Part Number: | FN2313 |
| Brand: | Koyo Radiator |
Complete your cooling system upgrade with the Koyo FN2313 Aluminum Radiator Filler Neck. Designed specifically for 2006–2011 Honda Civic applications, this CNC-machined aluminum filler neck provides a durable solution when using cooling system configurations that require a remote radiator fill point. It is an ideal companion for Koyorad aluminum radiators and engine swap applications where the factory filler location is no longer practical.
Constructed from high-quality aluminum for superior strength and corrosion resistance, the FN2313 is engineered to provide a secure seal and reliable coolant filling and bleeding. This filler neck requires a Koyorad SK-C13 (Type A) radiator cap or an equivalent deep-plunger cap, as the factory Honda radiator cap is not compatible.
Features
- Genuine Koyo Aluminum Radiator Filler Neck
- Part Number: FN2313
- Precision-machined aluminum construction for maximum durability
- Provides a convenient remote coolant fill point for modified cooling systems
- Corrosion-resistant finish for long service life
- Ideal for custom radiator hose routing and engine swap applications
- Direct-fit design for select 2006–2011 Honda Civic models
- Commonly used with Koyorad aluminum racing radiators
- Accepts Koyorad SK-C13 (Type A) or equivalent deep-plunger radiator caps
- OEM Honda radiator cap is not compatible
- Helps simplify coolant filling and air bleeding during installation and maintenance
- Engineered to Koyorad's high standards for fit, quality, and performance
WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.
Vehicle Fitment
Honda Civic
2008 Honda Civic MUGEN Si
2006 Honda Civic Si
2007 Honda Civic Si
2008 Honda Civic Si
2009 Honda Civic Si
2010 Honda Civic Si
2011 Honda Civic Si
2007 Honda Civic Si
2008 Honda Civic Si
2009 Honda Civic Si
2010 Honda Civic Si
2011 Honda Civic Si
1 Reviews ★★★★★
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David | April 12th, 2022
If you're upgrading the plastic radiator might as well upgrade the neck and cap. Very happy with my purchase nice fit and finish.











