Aeromotive Universal Bypass Regulator 13301 - A dual purpose, universal regulator for EFI or Carbureted and street or strip applications. Base pressure adjustable from 3 to 20 PSI with standard spring, (installed) or from 20 to 60 PSI with high pressure spring (included). Offers the full flow and rock steady fuel pressure that only a dynamic, Aeromotive bypass regulator provides. Capable of regulating any fuel pump between 100 and 250 GPH. Fuel pressure rises on a 1:1 ratio when referencing boost. All ports are 3/8' NPT, with one inlet and three outlets on the main body and one return port on the bottom. Bypass design provides the ultimate, dynamic fuel pressure control. Note: (Requires a return line to be installed from the bottom of the regulator to the top of the tank.)