[Size] The thread size of 8an is 3/4-16 UNF. The ID of spring lock is 5/16 inch. [Seal] The 8an flare efi fitting is sealed at 37 degree angle to avoid leakage. [Parameter] Working pressure: 1500psi, Temperature range: -40°F to 176°F. [Material] Made of aluminum alloy 6061-T6.Spring lock is made of plastic. [Application] Widely used in engine fuel rail, ls swap, transmission cooler, return line, fuel sensor, etc. EVIL ENERGY is our brand,we're a direct and professional manufacturer,one of greatest manufacturer and exporter in tuning parts include intake system, exhaust system,fuel line, cooling system,interior and exterior parts.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 6an 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.