Features: 1.Main Purpose: This filter regulator assembly is usually used to adjust the return flow fuel system for non return flow applications. It has an internal bypass valve to adjust the fuel output pressure to 58 psi (4 bar). 2.Application: It is applicable to the fuel system of simplified LS swaps or standalone EFI systems (such as for Holley, for FiTech or for FAST), and is designed for the static supply pressure of 58 psi. 3.Support for Single Fuel Feed Line: When installed near the fuel tank, the filter allows you to run to a single fuel supply line of the engine and just a short return loop back to the tank. 4.Retrofitting TBSS and NBS: This is the correct regulator required for LS Swaps using returnless style fuel rail, which can realize plug and play conversion, so as to convert the TBSS NBS intake manifold to 99?04 return NBS truck and other applications. 5.Simple Design: The fuel filter has a 3/8 male inlet, a 5/16 male return outlet and a 3/8 female supply outlet. This assembly combination makes for simple plumbing of fuel systems for LS Swaps and aftermarket EFI conversions. Specification: Item Type: Fuel Filter_x000D_ Material: Metal_x000D_ OE: 10299146_x000D_ Fitment: Replacement for Corvette C5 EFI or LS Swap Note: 1. The flow of the filters and regulators is limited to a maximum of 255 lph. Beyond this volume, the internal regulator cannot maintain sufficient return volume at low engine speed._x000D_ 2. Please double check the part number of your item, matching information is for reference only._x000D_ 3. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!