The Edelbrock Fuel Pressure Regulator Kits are designed to mount your regulator right beside the carburetor. They are made from billet aluminum and black powder coated for durability. They are designed for use with Holley standard flange or 4, 500 Dominator Series dual-feed carburetors on alcohol, turbo and supercharged gasoline engines. They will allow you to adjust fuel pressure from 4-1/2 to 9 PSI (Pounds per Square Inch) and are recommended for use with either the Edelbrock racing fuel pumps or any high-output fuel pumps. This regulator mounting plate is designed as a replacement for the Edelbrock single fuel pressure regulator kits and fits Holley square bore dual feed carburetors.