Carburetor Fuel Pressure Regulator Fuel Pressure Regulator Fuel Pressure Regulator; Carbureted; Gasoline; 3/8 in. NPT Inlet/Outlet; 1-4 PSI Range; Non-Return Style; Two Port; Shiny Finish; SPECIFICATIONS: Color: Shiny Fuel System Type: Gasoline Material: Aluminum Outlet Size: .375 in. NPT Pressure: 1-4 PSI Return Size: N/A Style: Non-Return WARNING CA Proposition 65: Yes FEATURES: Adjustable Fuel Regulation From 1 To 4 PSI .220 in. 7/32 in. Restriction 3/8in. Npt Ports 1 in. 2 Out Chrome Finish Mounting Bracket Included Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR Sprint Cup team and nearly every NHRA Pro-Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress-up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Exhaust, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.