Filler Neck Conversion for AST Removal on RX-7 FD

If your looking to delete the factory AST (Air Seperator 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.
Please contact us for pricing of this separately.