This filter/regulator assembly is commonly used when adapting return style fuel systems for use with returnless applications. Popular for simplifying the fuel system for swaps or standalone EFI systems such as , FiTech, or FAST designed to operate on 58psi of static supply pressure. When mounted near the fuel tank this filter allows you to run a single fuel feed line to the engine and just a short return loop back to the tank. This is the correct filter/regulator required for Swaps using returnless style fuel rails and also popular when doing popular the TBSS/NNBS Gen IV intake manifold swap. Using this filter/regulator between the returnless style fuel rails and your return style fuel lines allows for a plug and play style conversion for retrofitting TBSS/NNBS intake manifolds onto 99-04 return style NBS (/) truck and other applications. This fuel filter features an internal bypass that regulates fuel output pressure to 58psi (4 Bar). The filter features a 3/8 male inlet, 5/16 male return outlet, and a 3/8 female supply outlet. This fitting combination makes for simple plumbing of fuel systems for Swaps and aftermarket EFI conversions. Colour:Silver Material:Metal Note: These filter/regulators are flow limited to a maximum of 255lph. Beyond that volume, the internal regulator does not have the ability to maintainadequate return volume at low engine speeds. Package Contents: 1 * Fuel Filter Fuel Pressure Regulator with fittings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.