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Mishimoto

Mishimoto Coolant Fill Necks

4.38 out of 5 stars 13 Customer Reviews

Mishimoto aluminum coolant fill necks are CNC-machined and ready to be welded for use with your custom project! Offered in two sizes, these high performance fill necks include a screw-in nipple for overflow and are compatible with their high-pressure radiator caps. Customize your fabricated aluminum radiator with Mishimoto aluminum coolant fill necks.

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Mishimoto Coolant Fill Necks MMFN-L

Mishimoto Coolant Fill Necks MMFN-L

Mishimoto Coolant Fill Necks MMFN-L

Coolant Fill Neck, Weld-On, Aluminum, 42mm Diameter, Each

Part Number: MIO-MMFN-L

3.67 out of 5 stars ( 3 )

Estimated Ship Date: Monday 10/27/2025

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Estimated Ship Date: Monday 10/27/2025

Mishimoto Coolant Fill Necks MMFN-S

Mishimoto Coolant Fill Necks MMFN-S

Mishimoto Coolant Fill Necks MMFN-S

Coolant Fill Neck, Weld-On, Aluminum, 32mm Diameter, Each

Part Number: MIO-MMFN-S

4.6 out of 5 stars ( 10 )

Estimated Ship Date: Monday 10/27/2025

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Estimated Ship Date: Monday 10/27/2025

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