pressure regulator maintains a specific pressure range to effectively drain excess back into the tank, addressing intake manifold pressure differences during various driving conditions. Suitable for petrol, , and alcohol/E85 vehicles, making it versatile for different types. Constructed from billet aluminum, featuring AN8 ports for feed, AN6 port for return, and a 1/8'' NPT gauge port along with a vacuum boost line connection port. Adjustable pressure range from 3-70psi, with included springs for 20-45psi, 3-20psi, and 45-70psi, allowing for precise tuning. Easy adjustment of psi by turning the bolt on the top of the regulator, with an option to use an end cap if only one feed port is needed. The pressure regulator is designed to optimize delivery and performance across various driving scenarios. Its robust construction and adjustable features compatibility with a wide range of vehicles, including those running on E85. The included springs provide flexibility in pressure settings, allowing users to tailor the regulator to their specific needs. Color: Black Material: Metal Package Contents: 1pcs pressure regulator, 2pcs OR8-AN8 fittings, 1pcs OR6-AN6 fitting, 1pcs AN8 end cap , 2pcs spring, 1pcs gauge 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.