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Extreme Flow EFI Regulator Designed for use with Belt or Hex Drive Fuel Pumps. Compact, 2-Port Body with dual AN-10 inlet/outlet ports and one AN-10 return port. 0.500 High Flow Valve/Seat, able to handle 7-26 GPM 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