Extreme Flow EFI Regulator Designed for use with Eliminator, Pro-Pump and Dual A1000 fuel systems. Compact, 2-Port Body with dual ORB-10 inlet/outlet ports and one ORB-10 return port. 0.313 . High Flow Valve/Seat, able to handle 3-6 GPM Fuel Pumps 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. This product is not legal for sale or use on emission-controlled vehicles except when used on a dedicated race vehicle.