Feature:1. Application: Carb fuel pressure regulator is professionally designed for Holley and for Edelbrock carburetors, OE number is 12803, 3/8in NPT port (1 in, 2 out).2. Usage: Fuel pressure regulator is designed to precisely control the fuel pressure from the fuel pump to the carburetor, practical carb part.3. Function: Fuel pressure regulator enables you to regulate your fuel pressure based on your carburetor and vehicle application needs.4. Improve Carb Performance: Regulates fuel pressure to avoid valve needle and seat pressure overloads that can lead to overflows or drivability problems.5. Solid Material: Fuel pressure regulator is made of high strength zinc alloy material, anti rust, wearproof, sturdy, not easy to damage.Specification:Item Type: Fuel Pressure RegulatorMaterial: Zinc AlloyOE: 12-803Adjustable Fuel Adjustment Ranges: 4-1/2 to 9 psi, 0.220in (7/32in) limitPort Type: 3/8in NPT port (1 in, 2 out)Fitment:For Holley CarburetorFor Edelbrock carburetors.Package List:1 xFuel Pressure Regulator3 x Screw1 x Sealing RingNote:1. Please double check the part number of your item, matching information is for reference only.2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!