Description
If your looking to delete the factory AST (Air Separator Tank) from the cooling system of your FD3s then this is the part for you.
This is a genuine Mazda part that simply replaces the stock filler neck with two bolts. It is worth noting this this part is only compatible with certain filler necks (those that have a removable top section) You may also need the “O” ring if your original is not in great shape.
The seals are sold separately.
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