There are some good reasons to use EFI fitting. Cool fuel , these special adapter fittings are designed to quickly adapt a male EFI connection to a male 8AN fitting.
This makes converting EFI parts to a custom AN fuel system very simple.
Two filters is a coarser filter to protect the fuel pump ( pre filter ), then the finer filter after the pump to keep injectors from plugging up.
They require only a simple push together assembly, while providign a durable, high performance coupling for fluid system connections.
Many late model fuel system utilise quick connect fittings. When manufacturing aftermarket fuel cells, surge tanks, or fitting up billet fuel rails or pressure regulators to late model EFI vehicles, these fittings come into their own, providing complete plug and play use with the factory style quick disconnect female fittings.