The Banzai Racing Billet Aluminum Filler Neck is designed to be a direct replacement for the 86-88 FC RX-7 plastic filler neck. This part is used to eliminate the AST (Air Separation Tank) on the 93+ RX7 that have the two piece thermostat housing. The kit comes with a new Viton O-ring and stainless hardware. Uses OEM or aftermarket pressure cap.

Air Separation Tank (AST) (93+ RX-7)

 

Very cool!

 

Here is a great example of why I designed this product.

 

Chris, do you plan to offer a Black Ano option?

 

I do not, I thought about it but it would just get scratched up from the cap lip. It also sends us down the road of needing to offer red, blue, gold, purple etc. Trying to keep this affordable for people.