Replacement FM coolant overflow cap for NA/NB

Need to replace a lost cap for your FM aluminum coolant overflow tank? You're in luck; we now offer just the caps available individually. 

Please note that this cap fits the NA and NB FM aluminum coolant overflow tanks only. It will not fit the Moroso overflow or the FM aluminum washer bottle. If you need a replacement cap for your FM aluminum washer bottle, you can find that cap linked below.

Cap threads are 1 1/16" x 12.