This listing includes the following. Return style billet fuel pressure regulator. With hardware, 3/8 NPT ports. 0-15 psi fuel pressure gauge. Fuel pressure regulator bracket for 4150 style carburetors. Custom dual 6AN pre-assembled carb feed lines with swivel fittings. 6AN to 7/8-20 carburetor inlet adapter fittings. Fuel Pressure Regulator Features. Return / bypass style requires a return line to fuel tank. 3/8″ NPT inlet on the front, two 3/8″ NPT outlets: one on each side. 3/8 NPT return on the bottom. 5-12 psi pressure range, with maximum inlet pressure 20 psi. 6061-T6 Billet Aluminum, anodized for corrosion protection. 1/8 NPT gauge port with plug for external pressure gauge. Made in the USA. Regulators need to be mounted as close as possible to the carburetor to counter the effects of G-Forces stalling fuel in the lines. We have designed this kit to mount a fuel pressure regulator close to the carburetor and simplify plumbing the dual inlets. Please measure your available clearance to your valve cover before purchasing, regulator & gauge plus bracket extends out approximately 6 from carburetor. Please ask if you are unsure of your application. Regulator is adjustable from 5 to 12 psi, ideal for Holley carb is 6.5 to 7 psi. Regulator is return style, and requires plumbing a return line to the fuel tank. Regulator inlet is 3/8 NPT female, plumbing to feed regulator and return line is not included. Regulator inlet is on the side of the regulator next to the gauge port. Return line port (3/8 NPT threads) is on the bottom of the regulator. 1-1/2 diameter fuel pressure gauge reads 0-15 psi. Feed lines to carb are 7/8-20 which fit many performance Holley and other 4150 style carburetors, will not fit Barry Grant, Demon, Dominator / 4500 or Holley 4010 / Summit brand carburetors. Regulator bracket fits 4150 flange, 5-5/8 spacing between the carburetor mounting studs. Available in many color combinations, see my other listings. Does not include carburetor. I’m happy to answer any questions.