Made for Holley 4500 Dominator carburetors. This listing includes the following. Custom Billet Fuel Pressure Regulator, 3/8 NPT, made in the USA. Fuel Pressure Regulator Bracket, hardware. Fuel Pressure Gauge 0-15 psi. Custom pre-assembled carb feed lines with swivel fittings – now with 45 degree hose ends on both regulator and carburetor side. 6AN to 7/8-20 carburetor inlet adapter fittings. Will not fit Gen III Dominator carbs, see our other items for products that fit Gen III Dominator carbs. Maximum regulator inlet fuel pressure is 20 psi. Does not include carburetor. Regulators need to be mounted as close as possible to the carburetor to counter the effects of g-force 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. Regulator is blocking or “dead head” style, does not require return line to fuel tank. Regulator inlet is 3/8 NPT female , plumbing to feed regulator is not included. Regulator inlet is the bottom of the regulator (marked “IN”). Regulator features two 1/8 NPT ports for gauge, etc. 0-15 psi gauge is included in this kit. Feed lines to carb are 7/8-20 for Holley Dominator / 4500 carburetors. Regulator bracket fits 4500 flange, will not fit any other carburetors. I’m happy to answer any questions.