P/N 13301: Universal Return Style Regulator 

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). It offers the full flow and rock steady fuel pressure that only a dynamic, Aeromotive return style 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.
• Gasoline, ethanol, alcohol and diesel compatible.
• return style design provides the ultimate, dynamic fuel pressure control.
• This product is not legal for sale or use on emission-controlled vehicles except when used as a direct replacement part matching OEM specifications.
  Note: (Requires a return line to be installed from the bottom of the regulator to the top of the tank.)View Installation Instructions