Extreme Flow EFI Regulator Designed for use with Eliminator, Pro Pump, and Dual A1000 fuel system. Compact 2-port body with dual AN-10 inlet/outlet ports and one AN-10 return port. 0.313 High Flow Valve/Seat, able to handle 3-9 GPM Fuel Pump. Dual Springs expand operating pressure range while maintaining a low profile and reduced weight. Standard spring (installed) supports 30-75 PSI base fuel pressure. High pressure spring (included) supports 75-120 PSI base fuel pressure. Supports vacuum and boost reference on a 1:1 ratio with PSI.